-- Ben Armstrong, Virtualization Program Manager
Talking about core virtualization at Microsoft (Hyper-V, Virtual PC and Virtual Server).
A little known feature of Virtual PC is that if you have a couple of virtual machines open and want to quickly exit Virtual PC all together - you can hold down the control key and click the 'X' on the Virtual PC Console. This will automatically save state all running virtual machines and exit Virtual PC - without prompting you at all.
Cheers,Ben