I've been using XP forever. A few weeks ago I built a new pc. Core 2 quad (q8300), Radeon 5770, 4gb ddr3 memory and windows 7 64bit. It's a hell of a lot faster than my p4 2Ghz system with 512MB ram. VS2k8 and NetBeans IDE still runs like a dog on it, WTF?
Other than some UI changes, it's still windows as usual. Cool. All my sh*t still runs on it. Thats all I care about.