Not Yet!
I stuck with a combination of 2000 and Millennium until XP was in SP2 phase. I bought a Vista machine soon after it hit the market and got stung. While Windows 7 is a big step beyond Vista, I still see a lot of places such as "libraries", for instance, where HUGE Vista problems have just been "swept under the rug" rather than being fixed. While Windows 7 is a huge improvement over Vista, it is not yet "Vista done right". I think I will again wait until SP2 or so before I begin to migrate to Windows 7........or 8. I'll stick with a combination of 2000 and XP for a few months to a few years. XP, contrary to some doomsayers predictions, will remain a viable OS for the next 6 to 10 years. Maybe by then, some Linux developer will have figured out how common people want to use their computers and we can all migrate away from Microsoft all together.