I've got Ubuntu 10.10 on my Thinkpad X200 Tablet. It works pretty well, but not everything works perfectly. I've had every version of Ubuntu on it since 9.04, and some of the earlier ones actually seemed to work a little better. There are still a few kinks, though. Thankfully, sites like ThinkWiki exist to help with some of the problems.
I'm still having a few issues, though, such as the fingerprint scanner not working or when rotating the screen, the touch sensor doesn't translate its coordinates properly (so left-right becomes up-down when the screen is rotated 90 degrees). The mute button doesn't work properly either, but other than that it runs pretty well.
We want to create puppets that pull their own strings. - Ann Marion