virtualbox - what is your virtual machine ?

I use http://virtualbox.org for my virtual machine needs, just wondering what anyone else uses ? I have tried vmware, but just found it slower.

Right now I use VirtualPC from Microsoft just because its what XP Mode uses default on Windows 7. Haven't really looked into using anything else yet.

I use VirtualBox. Haven't had any problems with it. For a free product, it's very polished and works very well.

thanks for your replies

Spoof - just wondering how are you finding VirtualPC and can you virtualize 32 + 64 modes CPUs ?

Also what do you think to Windows 7 ? I did try it in virtual mode and was not really that over impressed with what seems like XP SP 5.. or was I missing something ? it differently is far better than Vista.