diff --git a/src/source/building-devices.md b/src/source/building-devices.md
index f6d74cb..5ab3409 100644
--- a/src/source/building-devices.md
+++ b/src/source/building-devices.md
@@ -142,12 +142,12 @@
 Device   | Branch           | Build configuration
 ---------|------------------|------------------------
 maguro   | android-4.0.3_r1 | full_maguro-userdebug
-panda    | master           | full_panda-eng
+panda    | master           | full_panda-userdebug
 wingray  | android-4.0.3_r1 | full_wingray-userdebug
 crespo   | android-4.0.3_r1 | full_crespo-userdebug
 passion  | android-2.3.6_r1 | full_passion-userdebug
-sapphire | android-2.2.2_r1 | full_sapphire-userdebug
-dream    | android-2.2.2_r1 | full_dream-userdebug
+sapphire | android-2.2.3_r1 | full_sapphire-userdebug
+dream    | android-2.2.3_r1 | full_dream-userdebug
 
 ## Flashing a device ##
 
diff --git a/src/source/cla-corporate.pdf b/src/source/cla-corporate.pdf
new file mode 100644
index 0000000..09dc022
--- /dev/null
+++ b/src/source/cla-corporate.pdf
Binary files differ
diff --git a/src/source/initializing.md b/src/source/initializing.md
index 7d90f43..51f5123 100644
--- a/src/source/initializing.md
+++ b/src/source/initializing.md
@@ -67,6 +67,9 @@
     $ sudo apt-get update
     $ sudo apt-get install sun-java5-jdk
 
+*Note: The `lunch` command in the build step will ensure that the Sun JDK is
+used instead of any previously installed JDK.*
+
 ## Installing required packages (Ubuntu 10.04 -- 11.10) ##
 
 Ubuntu 10.04 64-bit is recommended.  Building using a newer version of Ubuntu or a 32-bit Ubuntu is
diff --git a/src/source/licenses.md b/src/source/licenses.md
index 9d5bc1f..0405e84 100644
--- a/src/source/licenses.md
+++ b/src/source/licenses.md
@@ -44,7 +44,7 @@
 
 For a *corporation* (or other entity) that has assigned employees to
 work on the Android Open Source Project, a [Corporate
-Contributor License Grant](cla-corporate.html) is available. 
+Contributor License Grant](cla-corporate.pdf) is available. 
 This version of the grant allows a
 corporation to authorize contributions submitted by its designated employees
 and to grant copyright and patent licenses. Note that a Corporate Contributor
diff --git a/src/source/submit-patches.md b/src/source/submit-patches.md
index 24a59a2..07bcbe6 100644
--- a/src/source/submit-patches.md
+++ b/src/source/submit-patches.md
@@ -41,7 +41,7 @@
 
 For each change you intend to make, start a new branch within the relevant git repository:
 
-    $ repo start NAME
+    $ repo start NAME .
 
 You can start several independent branches at the same time in the same repository. The branch NAME is local to your workspace and will not be included on gerrit or the final source tree.
 
@@ -111,7 +111,7 @@
 
 ## After a submission is approved ##
 
-After a submission makes it through the review and verification process, Gerrit automatically merges the change into the public repository. The change will now be visible in gitweb, and others users will be able to run `repo sync` to pull the update into their local client.
+After a submission makes it through the review and verification process, Gerrit automatically merges the change into the public repository. Other users will be able to run `repo sync` to pull the update into their local client.
 
 # For reviewers and verifiers #
 
@@ -171,10 +171,6 @@
 
 To publish your comments so that others using Gerrit will be able to see them, click the Publish Comments button. Your comments will be emailed to all relevant parties for this change, including the change owner, the patch set uploader (if different from the owner), and all current reviewers.
 
-## Using GitWeb to track patch histories ##
-
-To view snapshots of the files that are in the public Android repositories and view file histories, use the [Android instance of GitWeb](http://android.git.kernel.org/).
-
 <a name="upstream-projects"></a>
 
 # Upstream Projects #
diff --git a/src/source/using-eclipse.md b/src/source/using-eclipse.md
index 5af32a8..94e24cf 100644
--- a/src/source/using-eclipse.md
+++ b/src/source/using-eclipse.md
@@ -42,7 +42,7 @@
 
 ### Increase Eclipse's Memory Settings ###
 
-The Android project is large enough that Eclipse's Java VM sometimes runs out of memory while compiling it. Avoid this problem by editing the the `eclipse.ini` file. On Apple OSX the eclipse.ini file is located at 
+The Android project is large enough that Eclipse's Java VM sometimes runs out of memory while compiling it. Avoid this problem by editing the `eclipse.ini` file. On Apple OSX the eclipse.ini file is located at
 
     /Applications/eclipse/Eclipse.app/Contents/MacOS/eclipse.ini
 
diff --git a/src/tech/datausage/excluding-network-types.md b/src/tech/datausage/excluding-network-types.md
new file mode 100644
index 0000000..dcaf64f
--- /dev/null
+++ b/src/tech/datausage/excluding-network-types.md
@@ -0,0 +1,29 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+A mobile operator may wish to exclude specific network types from the
+total data usage calculated by a device.  For example, network traffic
+over an MMS APN may be “zero-rated” by a mobile operator.  To support
+this, the set of network types used to calculate total data usage can
+be configured through the `config_data_usage_network_types` resource
+at build time.
+
+Some mobile radio implementations may have unique Linux network
+interfaces for each active APN, while other radios may force multiple
+APNs to coexist on a single interface.  Android can collect network
+statistics from both designs, but `config_data_usage_network_types` is
+not be effective at excluding APNs forced to coexist on a single
+interface.
diff --git a/src/tech/datausage/iface-overview.md b/src/tech/datausage/iface-overview.md
new file mode 100644
index 0000000..fd1e3cc
--- /dev/null
+++ b/src/tech/datausage/iface-overview.md
@@ -0,0 +1,49 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+
+In Android 4.0, statistics reported by Linux network interfaces are
+recorded over time, and are used to enforce network quota limits,
+render user-visible charts, and more.
+
+Each network device driver (Wi-Fi included) must follow the standard
+kernel device lifecycle, and return correct statistics through
+`dev_get_stats()`. In particular, statistics returned must remain
+strictly monotonic while the interface is active. Drivers may reset
+statistics only after successfully completing an `unregister_netdev()`
+or the equivalent that generates a `NETDEV_UNREGISTER` event for
+callbacks registered with `register_netdevice_notifier()` /
+`register_inetaddr_notifier()` / `register_inet6addr_notifier()`.
+
+Mobile operators typically measure data usage at the Internet layer
+(IP). To match this approach in Android 4.0, we rely on the fact that
+for the kernel devices we care about the `rx_bytes` and `tx_bytes`
+values returned by `dev_get_stats()` return exactly the Internet layer
+(`IP`) bytes transferred.  But we understand that for other devices it
+might not be the case. For now, the feature relies on this
+peculiarity. New drivers should have that property also, and the
+`dev_get_stats()` values must not include any encapsulation overhead
+of lower network layers (such as Ethernet headers), and should
+preferably not include other traffic (such as ARP) unless it is
+negligible.
+
+The Android framework only collects statistics from network interfaces
+associated with a `NetworkStateTracker` in `ConnectivityService`. This
+enables the framework to concretely identify each network interface,
+including its type (such as `TYPE_MOBILE` or `TYPE_WIFI`) and
+subscriber identity (such as IMSI).  All network interfaces used to
+route data should be represented by a `NetworkStateTracker` so that
+statistics can be accounted correctly.
diff --git a/src/tech/datausage/index.md b/src/tech/datausage/index.md
new file mode 100644
index 0000000..279f851
--- /dev/null
+++ b/src/tech/datausage/index.md
@@ -0,0 +1,37 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+# Data Usage Technical Information #
+
+Android 4.0 (Ice Cream Sandwich) introduces new features that help
+users understand and control how their device uses network data.  It
+monitors overall data usage, and supports warning or limit thresholds
+which will trigger notifications or disable mobile data when usage
+exceeds a specific quota.
+
+Data usage is also tracked on a per-application basis, enabling users
+to visually explore historical usage in the Settings app. Users can
+also restrict how specific applications are allowed to use data when
+running in the background.
+
+The documentation in this section is intended for systems integrators
+and mobile operators, to help explain technical details they should be
+aware of when porting Android to specific devices.  These details are
+summarized below, and the
+[android-porting](mailto:android-porting+subscribe@googlegroups.com)
+mailing list is a good place for further discussion.
+
+
diff --git a/src/tech/datausage/kernel-changes.md b/src/tech/datausage/kernel-changes.md
new file mode 100644
index 0000000..f89847f
--- /dev/null
+++ b/src/tech/datausage/kernel-changes.md
@@ -0,0 +1,29 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+This is a summary of the main changes in the kernel that diverge from mainline.
+
+* added net/netfilter/xt_qtaguid*
+* imported then modified net/netfilter/xt_quota2.c from xtables-addons project
+* fixes in net/netfilter/ip6_tables.c
+* modified ip*t_REJECT.c
+* modified net/netfilter/xt_socket.c
+
+A few comments on the kernel configuration:
+
+* xt_qtaguid masquerades as xt_owner and relies on xt_socket and itself relies on the connection tracker.
+* The connection tracker can't handle large SIP packets, it must be disabled.
+* The modified xt_quota2 uses the NFLOG support to notify userspace.
diff --git a/src/tech/datausage/kernel-overview.md b/src/tech/datausage/kernel-overview.md
new file mode 100644
index 0000000..d21e0a3
--- /dev/null
+++ b/src/tech/datausage/kernel-overview.md
@@ -0,0 +1,55 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+# Overview #
+
+The per-application/delegated data usage monitoring and tracking
+functionality relies on the xt_qtaguid module in the android-3.0 Linux
+kernel (`kernel/net/netfilter/xt_qtaguid`). The socket tagging
+functionality in the framework (`system/core/libcutils/qtaguid.c`)
+relies mainly on the existence of `/proc/net/xt_qtaguid/ctrl`
+interface exported by the `xt_qtaguid` kernel module.
+
+The `quota2` netfilter module (originally part of `xtables-addons`)
+allows the functionality to set named quota limits and was extended to
+support notifying userspace when certain limits are reached. Once the
+quota limit is reached, the `quota2` module discards all subsequent
+network traffic. The framework can also specify additional rules to
+restrict background data traffic for an application (refer to
+`com.android.server.NetworkManagementSocketTagger.setKernelCounterSet`
+and
+`android.net.NetworkPolicyManager.POLICY_REJECT_METERED_BACKGROUND`).
+
+# How does it work? #
+
+The `qtaguid` netfilter module tracks the network traffic on a
+per-socket basis for every application using the unique UID of the
+owning application.  There are two tag components associated with any
+socket in the system. The first is the UID which uniquely identifies
+the application which is responsible for the data transfer (Linux
+allows the ability to ascribe the ownership of each network socket to
+the UID of the calling application). The second tag component is used
+to support additional characterization of the traffic into application
+developer specified categories. Using these application level tags, an
+application can profile the traffic into several sub-categories.
+
+In the case of applications that provide network data transfer as a
+service, such as the download manager, media streaming service, etc,
+it is possible to attribute the ownership of the network data transfer
+to the UID of the requesting application using the
+`TrafficStats.setThreadStatsUid()` function call. The caller must hold
+the “`android.permission.MODIFY_NETWORK_ACCOUNTING`” permission to
+re-assign the ownership of the network traffic.
diff --git a/src/tech/datausage/sidebar2.md b/src/tech/datausage/sidebar2.md
new file mode 100644
index 0000000..348c684
--- /dev/null
+++ b/src/tech/datausage/sidebar2.md
@@ -0,0 +1,11 @@
+# Network interface statistics #
+- [Overview](/tech/datausage/iface-overview.html)
+- [Excluding network types from data usage](/tech/datausage/excluding-network-types.html)
+- [Tethering data](/tech/datausage/tethering-data.html)
+- [Usage cycle reset dates](/tech/datausage/usage-cycle-resets-dates.html)
+
+# The xt_qtaguid netfilter kernel module #
+- [Overview](/tech/datausage/kernel-overview.html)
+- [Data usage tags explained](/tech/datausage/tags-explained.html)
+- [Kernel changes](/tech/datausage/kernel-changes.html)
+
diff --git a/src/tech/datausage/tags-explained.md b/src/tech/datausage/tags-explained.md
new file mode 100644
index 0000000..90b6a29
--- /dev/null
+++ b/src/tech/datausage/tags-explained.md
@@ -0,0 +1,48 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+Tags represent one of the metrics the data usage counters will be
+tracked against. By default, and implicitly, a tag is just based on
+the UID. The UID is used as the base for policing, and cannot be
+ignored. So a tag will always at least represent a UID (uid_tag). A
+tag can be explicitly augmented with an "accounting tag" which is
+associated with a UID. User space can use
+`TrafficStats.setThreadStatsTag()` to set the acct_tag portion of the
+tag which is then used  with sockets: all data belonging to that
+socket will be counted against the tag. The policing is then based on
+the tag's uid_tag portion, and stats are collected for the acct_tag
+portion separately.
+
+Without explicit tagging, the qtaguid module will assume the
+`default_tag:  {acct_tag=0, uid_tag=10003}`
+
+        a:  {acct_tag=1, uid_tag=10003}
+        b:  {acct_tag=2, uid_tag=10003}
+        c:  {acct_tag=3, uid_tag=10003}
+
+`a, b, c…` represent explicit tags associated with specific sockets.
+
+`default_tag (acct_tag=0)` is the default accounting tag that contains
+the total traffic for that uid, including all untagged
+traffic, and is typically used to enforce policing/quota rules.
+
+These tags can be used to profile the network traffic of an
+application into separate logical categories (at a network socket
+level). Such tags can be removed, reapplied, or modified during
+runtime.
+
+The qtaguid module has been implemented on [kernel/common branch of
+android-3.0](https://android-review.googlesource.com/#/q/project:kernel/common+branch:android-3.0,n,z)
diff --git a/src/tech/datausage/tethering-data.md b/src/tech/datausage/tethering-data.md
new file mode 100644
index 0000000..0bc8f89
--- /dev/null
+++ b/src/tech/datausage/tethering-data.md
@@ -0,0 +1,20 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+Tethering involves forwarding of traffic from one network interface to
+another using `iptables` forwarding rules.  The framework periodically
+records tethering statistics between any interface pairs returned by
+`ConnectivityService.getTetheredIfacePairs()`.
diff --git a/src/tech/datausage/usage-cycle-resets-dates.md b/src/tech/datausage/usage-cycle-resets-dates.md
new file mode 100644
index 0000000..9bddad6
--- /dev/null
+++ b/src/tech/datausage/usage-cycle-resets-dates.md
@@ -0,0 +1,22 @@
+<!--
+   Copyright 2012 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+
+Users can specify a day of month upon which their data usage
+resets. Internally, cycle boundaries are defined to end at midnight
+`(00:00) UTC` on the requested day. When a month is shorter than the
+requested day, the cycle resets on the first day of the subsequent
+month. For example, a cycle reset day of the 30th would cause a reset
+on January 30 at `00:00 UTC` and March 1 at `00:00 UTC`.
diff --git a/src/tech/index.md b/src/tech/index.md
index 5653bda..d871a9a 100644
--- a/src/tech/index.md
+++ b/src/tech/index.md
@@ -58,3 +58,13 @@
 keyboard, joysticks, mice and other devices.
 
 [&raquo; Input Information](/tech/input/index.html)
+
+## Data Usage Technical Information ##
+Android's data usage features allow users to understand and control how their
+device uses network data. This document is designed for systems integrators
+and mobile operators, to help explain technical details they should be aware
+of when porting Android to specific devices.
+
+[&raquo; Data Usage Information](/tech/datausage/index.html)
+
+
diff --git a/src/tech/sidebar.md b/src/tech/sidebar.md
index 3f81124..c3701fd 100644
--- a/src/tech/sidebar.md
+++ b/src/tech/sidebar.md
@@ -4,3 +4,4 @@
 - [Encryption](/tech/encryption/index.html)
 - [Security](/tech/security/index.html)
 - [Input](/tech/input/index.html)
+- [Data Usage](/tech/datausage/index.html)