Windows 7 is a wonderful Operating System. My favorite part of it is the taskbar management, which helps me out a lot compared to clunky vista or XP. I've used all three, and I have to say, besides bells and whistles, they're all very similar to me. (You need two gigs of ram to run Vista or it'll suck, so stop saying it's vista that's bad and get a decent computer.) As long as an operating system can run all my programs and games, I have no problem with it at all.
Windows 7 is going to be expensive, $200 for premium, so I'll probably hold off until I build a new computer, and the system builder's edition comes out, which is usually almost half the price.