[How To] Root the Motorola Xoom
NOTE: This root method is for the 3G/4G model ONLY!
# Download the XOOM root zip here: http://mirror1.kanged.net/motorola/s...y/xoomroot.zip
# Unzip the package.
# Put your junk in the box.
adb reboot bootloader (skip the next 3 steps if you have already unlocked via fastboot)
fastboot oem unlock
# wait for reboot
adb reboot bootloader
fastboot flash boot rootboot.img
fastboot reboot
# wait for reboot
adb remount
adb push su /system/bin/
adb shell ln –s /system/bin/su /system/xbin/su
adb shell chmod 4755 /system/bin/su
adb push Superuser.apk /system/app/
Source: My Brain Hurts: Motorola XOOM Rooted
Click here for WiFi root method