Just a heads up, the Xoom can run ADB natively. Full ADB. Haven't tested it over USB Host, but it works with ADBwireless.
Doesn't seem to be documented anywhere, but it does work. Try ADB devices from a terminal on your xoom.
Meaning that the Xoom can run ADB, just like your computer. Pull APKs, ringtones, media, whatever over wifi.
EDIT: These commands should make it work without the apk.
To trigger adb wifi on your phone/non-Xoom:
setprop service.adb.tcp.port 5555 stop adbd start adbd
setprop service.adb.tcp.port -1 stop adbd start adbd
adb connect [IPAddress]:[port]
Or from USB on your comp:
adb tcpip 5555 adb connect 192.168.0.101:5555