My vote for most useful post of the day 
While we're on the Win 7 subject...
I'm in the process of changing from evaluation copies to full versions, the first computer was fine as it was a full home premium version, the 2nd, however, is going to be an upgrade from XP.
From what I understand I will have to remove the Win 7 evaluation copy (i.e. format drive partition) then reinstall Win XP before performing the upgrade.
The question is, if I need to do a re-install of Win 7 in the future will I need to go through the XP install again or will activation/registration allow a straight install using the upgrade disk?