http://blogs.technet.com/b/chitpro-en/archive/2009/03/13/server-virtualization-platform-performance.aspxVirtualization Review published a comparative performance test of three hypervisors: VMware ESX 3.5, Windows Server 2008 Hyper-V and Citrix XenServer. The results? Windows Server 2008 Hyper-V won 4 of the 11 tests, XenServer won the other 7 by a narrowen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)