i can confirm that if 

 - you have a compaq elitebook 8730w (intel centrino duo 2 vpro)
 - turn on virtualization technology on in the BIOS
 - run windows xp (32bit) as your OS

you *can* run windows server 2008 64bit as a guest OS, using VMWare workstation 7.0.0 build-203739

i have done this so i can run sharepoint 2010 beta on my company laptop for hosting the corporate intranet and extranet (only kidding, for demos!)

Virtual PC will not work!  Hyper-v is useless to me...

tristian o'brien