[Xoom Android Development] publicanimal:
[size=+1]THIS THREAD IS OUTDATED!!!!!!!!!!!!! DO NOT USE THIS METHOD TO ROOT UNLESS YOU ARE RUNNING 3.1.[/size]

I recommend using this root method courtesy of solarnz: http://xdaforums.com/showthread.php?t=1242241

WARNING: Following this procedure may damage or permamently destroy your device. This procedure is provided with NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Perform this procedure at your own risk.

Follow these instructions after unlocking your Xoom to acquire root access on your Xoom. Comes in handy if you just installed the OTA and lost root.

[size=+1]DOWNLOAD:[/size]

WiFi_RootTool_3.1.zip

[size=+1]SUMMARY[/size]

Pushes Superuser, su, and other root files. Sets correct permissions to enable functioning root

Enables external SD card storage (in /sdcard/external)

Prevents system from over-writing custom recovery

Enables USB On-The-Go

[size=+1]ASSUMPTIONS[/size]

You've unlocked your Xoom (this will wipe your data)

You've downloaded the WiFi_RootTool_3.1.zip

You've downloaded a recent ClockworkMod recovery image to your PC: ClockworkMod Recovery (make sure to download the .img, not the .zip)

You've installed a physical SDCard in your Xoom (required for ClockworkMod Recovery updates) and have it functioning properly

You've configured the Android SDK on your PC, with adb functioning properly

You've downloaded fastboot and have it functioning properly (usually alongside adb in platform-tools)

[size=+1]PROCEDURE[/size]

Read through this once before you do it. After performing step 2 you will have to do step 3 immediately or you will have to repeat step 2.

1. Prepare your SD Card

Using an SD Card reader (or Android phone?), move the XOOM_RootTool_3.1.zip file from your PC to the root of your SD Card. Once that is done, install the SD Card into your Xoom. Alternately you can mount the SD Card through the Xoom in recovery after you boot into recovery in step 3 by selecting 'mounts and storage > mount USB storage'. It's always nice to have options.

2. Flash ClockworkMod recovery.img

Connect the usb cable from your PC to your Xoom. Make sure USB Debugging is activated in the Application settings menu.

Connect the usb cable from your PC to your Xoom.

Open up your command prompt naviagate to the folder with adb, then (change 'XXXXXX-XXXX' in code to match filename):

adb reboot bootloader
fastboot flash recovery recovery-solarnz-XXXXXX-XXXX.img
fastboot reboot

3. "Catch the boot" to boot into recovery

This requires some quick reflexes. As soon as you send the 'fastboot reboot' command in the previous step, your device will reboot. You have to boot into recovery right away or your Xoom will reflash the stock recovery over the custom recovery you just installed. Here's how to "catch the boot" and reboot into recovery.

When you see the Motorola logo appear, wait approximately 3 seconds.

Tap the Volume Down button. You should see the words "Android Recovery" appear at the top of the screen. Now tap the Volume Up button to boot into recovery.

If when attempting to "catch the boot" it says 'Starting Fastboot protocol support' then you hit Volume Down too soon. Hold Vol UP + Power to reboot and try again.

4. Flash WiFi_RootTool_3.1.zip

In ClockworkMod Recovery, select "install zip from sdcard"

Select "choose zip from sdcard"

Select "WiFi_RootTool_3.1.zip"

Select "Yes - Install WiFi_RootTool_3.1.zip"

After install select "Reboot System Now"

5. Enjoy root!