As long as you're getting one for Warrior, Rabit, and Ergot...
I've tried messing around with it on VMWare and its just too slow to use it for anything.
You'll have to allocate it 512MB of ram and possible turn Aero Basic or Classic Mode on.
What's neat about using VMWare or Virtual Server to run Vista is that, if I connected to it with Remote Desktop from a computer running Vista that supported Aero, the Aero effects would be visible even though the virtual machine didn't have the hardware.
You can use one key for like 10 people, share with your ten bestest friends from x86.
Unfortunately it doesn't work like that. I can use one key for 10 activations. Since I have at least two computers that will be using it with a possible third coming soon, I don't want to jump the gun by giving out my activation keys for Vista.