UND, actually, I don't see a lot of home users using Windows XP-64. It is just not possible to have robust driver support in that time frame, or even in the year to follow. I think you'll find plenty of enthusiast, as well as some workstation users, adopt Windows XP-64 for the >4GB of memory support, but I don't think you'll find a lot of applications in the short term that will even be ported to x86-64 to justify the extra costs that Microsoft will put on this OS (excluding, of course, those enthusiasts who already get it for free ;-).
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