Received my 3.1 update this morning. I read a forum post that someone powered off their xoom overnight and the update showed up when they powered back up the next morning. I tried that last night, and, low and behold, the update showed up this morning. I don't know if it is coincidence or not, but my xoom is updated to 3.1 and I am a happy camper. A thank you goes out to the person who posted the overnight power down trick.