I use Windows 7 Ultimate on my desktop rig ONLY for gaming or if I'm walking somebody through something. I use Ubuntu for everything else: surfing, music, homework, videos/movies, etc. I have Virtualbox in Ubuntu, and besides having Windows 3.1, 98, OS/2, Damn Small Linux, Fedora 4, Slitaz, and a few others, I have XP Pro (taken from my old rig) for when someone comes along with an XP problem I need to research.