I run Windoze XP Pro on my main work station primarily because of Photoshop (no, I'm not going to use GIMP) and certain games. But my old machine and my laptop both run Ubuntu Linux. Rock solid. Never could get my laptop to recognize the wireless card though and never cared enough to hunt down the right kind. Secretly I'm hoping the next release of Ubuntu will fix it.
I would really like to have a Mac again someday, maybe a laptop, then I could run my few Windoze-only programs on it with Bootcamp.