My 2p:

Have an iMac 27" , core i7 and think it is the dogs danglies, however Windows 7 is getting there, finally. Still, I work with IT and hate Microsoft with a vengeance (the company not so much the products) so refuse to have them in the house (including x-box).

That withstanding, I still have had to create logmein profiles for all members of my family, XP, Vista and now windows 7, as I am continually hassled for support services… 😆