Reposted from my old blog - the old comments are there.
Xen can run unmodified DomUs (guest OSs), including Windows [pdf] or potentially any x86 or x86_64 OS, if your CPU supports Intel VT (aka Vanderpool) or AMD-V (aka Pacifica and SVM). I've always known that in theory, but I guess I haven't been keeping up with the news. It turns out all Athlon64 CPUs for the new Socket AM2 (and apparently some or all Pentium D Preslers) support SVM, and the latest Xen 3.0.2 can use that.
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