Bah.. there is an file transfer system you can use so to not lose all your stuff if you go from XP to 7. Yes, the hardware drivers wont work, but geez, I doubt anyone has like 20 different things plugged into their PCs?! It's not like it takes 2 weeks to get your drivers installed.
Still using a 7100 RC build and it's 90% of the time better than XP was.
