That's an interesting notion. I'd have to figure out how to actually do that before I can, however (and it'll have to be after I get home; this laptop is a bit diskspace-challenged having only an SSD drive).
EDIT: Except, of course I can't create the VHD using virtual PC. If I boot the Windows 8 setup from a DVD or USB stick, is there anyway I can get it to install to a VHD?
EDIT2: This appears to be possible with Win7, I'll have to try it with Win8. I will report back tonight after I've tried it.