I've recently installed Ubuntu Karmic on my ThinkPad X61 Tablet, which has been upgraded with a 80GB Intel X25-M SSD. With this combination of solid state disk and the first Ubuntu version to use exclusively Upstart, the start-up and shut-down times are truly amazing! For me start-up now only takes 25 seconds and shut-down 4 seconds!

For a fresh install you'll probably need to install quite a few software packages. For this I always find the Ubuntu guide to be very useful. It's also kept very up-to-date, so you can be sure that they already cover the latest Ubuntu version at the point of its release.

Most of the features of the X61t work perfectly fine out-of-the-box in Karmic. However, there are still some that need some tweaking, among them touch input, tablet tilt and some special buttons.