What exactly do you want to know.
I'm not a big virtualization user or fan, particularly. I'm almost an exclusive Windows users so all I'd do is run a virtualized Windows, within a host Windows install, which doesn't make a lot of sense generally. I was recently contemplating running a virtualized 7 Starter within a Vista Ultimate host, for no other reason than I can.

I don't like virtualization because it's always such a terrible performance hit. The performance hit is so great, generally, it's tough to determination about anything in that virtualized OS.
I use Windows Virtual PC because...well..., I do everything through Microsoft. I was going to download VMware but they want you to register. I don't want a relationship with them just to download this program!