use the easy migration wizard
A few words from the wise - you will need to run the wizard under each user login, as there's no way to "batch" the process for multiple user accounts (that is certainly the case with the XP tool).
Keep a full backup copy of the "Documents and settings" folder - there's several things that the wizard doesn't transfer that you can transfer manually with selective copying and pasting from the Application Data and Local Settings folders, for example.
SD