The tablet on the X61t is amazing. Unfortunately, not everything works out of the box. This guide goes through setting up most of the tablet-related things on the x61t. More here

Ubuntu 9.04 does something strange with the names of each device, so if you go and try to use any of the utilities that were just installed (wacomcpl and xset wacom being just a few of what is included in the above), it can’t find the actual input devices. In order to remedy this, we need to install a short script from the Ubuntu forums.