I too am a happy Ubuntu convert... Aside from a few little issues, like my USB headphones play sounds in movies off my hard drive, but videos in Firefox, a la youtube don't play... Neither to system sounds... And Skype for Linux doesn't recognize my headset... I suppose that's what I get for having a Microsoft headset
And Steam doesn't work right in Wine, so no Portal for me. But I regard that as a good thing, because then I'm not tempted to play games when I'm supposed to be studying. I just post on game forums instead.