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I second the above.
I can't say that I tried Virtual PC (I'm using Linux), but both VMWare Workstation and now VMWare Server are rock solid, running anything from Windows NT 4.0, XP, 32/64bit Linux and 32/64bit BSD.
I doubt that VPC can come even close to that
I will third the above. The comparison was compleletly unscientific and lacking in useful details. It was just like some guy playing around.