I'm posting from my old IBM Thinkpad X23, running Ubuntu 7.10 (Gutsy Gibbon). I had Kubuntu previously, but decided to uninstall and try out Ubuntu, and I'm pretty impressed! Everything seems to work right out of the box - so far. The biggest headache I previously had was getting the wireless to run, but this set up peachy keen.
I think my room has officially turned into the nerdery. In front of me I have a total of 4 computers: a PC desktop, two macs (iBook and PowerBook), and the Thinkpad. Don't ask.