Ubuntu 7.10, upgraded just prior to the release(About a week and a half I was using the beta, release candidate, version). Seems stable so far, haven't had Windows on my computer or laptop for at least 4 years now... Long time, now that I think about it. lol
I would use Windows, for games and such, but Ubuntu, and Linux in general, is fine for me. Plus I can't afford to buy Windows atm.
As a side note... Been a while since I've been here. Thought I'd say hello to everyone and wish CF a happy 5th birth day.