Use this if you have no available partition, drive or extra computer.

How to use a VHD to dual-boot Windows 8 on a Windows 7 PC | ZDNet

Cheers,
Drew

Very useful article, Drew. Ted Bott tends to explain things better than the other writers at ZDNet.

The Bad: One must have Windows 7 Enterprise (corporate users) or Ultimate (home users) for it to work, as Ted pointed out, & I confirmed this here.

Windows 7 editions - Wikipedia, the free encyclopedia

Cat

That's what I've used to test Windows 8. It's nice because you don't have to partition and deal with the potential problems involved with that. When your done simply delete it and no repartitioning to recover the space.
Joe

I've installed Win8 on VM and its working great including the speed and performances.

No surprise it's working but, still, nice news & great to hear.... enjoy.

Cheers,
Drew