I agree too - VMware guest machines don't care what the host operating system is. I've moved machines between Linux and Windows quite happily.
I believe also you can have a 64bit host operting system and run 32bit guests although I've yet to try this - I need to do it now as ePortal needs more than 1GB to run well and I have two VMs on a 32bit windows machine.
Also the VMWare converter works well - this allows you to convert a real machine into a VM.
N