I'm just curious... which OS do you actually use for the majority of things? I've got a friend who triple boots his PC with Windows 7, Windows XP and Ubuntu Linux. He says he needs it all... and yet, I don't see how. He is just a standard PC user, not a very big gamer and not a developer. He uses XP the most. I personally just like to stick to one OS, which for me, is OS X 10.6. Just curious which one you guys use the most and whether you bother with Dual Booting or Virtual Machine gear?