Ew, Shambler. ME? Come on now, that's digusting, obscene behavior and I don't think it should be allowed on these boards. Think of the children, for god's sake!
I remember using ME... I went back to 98 SE pretty damn quick. Of course, I've been running 2000 Pro for quite a while now, and have never had any of the stupid little problems that one would normally get with previous versions.
XP annoyed me. Everything was too automated. Even after you went through the entire OS and turned off every stupid little GUI feature, you'd still have wizards popping up trying to teach you how to right click or something...
Way too newbie-friendly for my tastes. I need bare-bones stuff
As for Linux... Redhat now has a commercial version, I believe. Personally though, I've always favored Mandrake *shrugs*