I upgraded my laptop the other day to use Windows 7 RC. I am really liking the speed improvements and the windows virtual pc that it comes with. Dont forget to enable virtualization on your microprocessor in your computer's bios settings if you want to use windows virtual pc.
The other day after the upgrade I was not able to log into my account. I got an message User Profile Service Failed the Logon. The error was caused by a messed up registry key for the user profile for my account. Well I was able to boot into safe mode and follow the instructions in this post in the Windows Vista Forums and fix the problem.