Very interesting article by Citrix's Simon Crosby today. Citrix have done some VDI workload density analysis and found an interesting result that Hyper-V 2008 R2 is outperforming Xenserver for Windows 7 workloads. Wheres VMware in this? Who knows. They dont encourage open performance benchmarking so you have to question any result they publish, but it definitely shows Hyper-V 2008 R2 is no slouch!

http://community.citrix.com/pages/viewpage.action?pageId=131334785