CloudNet

Benchmarks: Citrix XenDesktop 2.1 vs VMware View 3.0 | virtualization.info: "Have you tested Parallels? Give it a try and you'll see how well it works for VDI. Lastly, you can use the Data Center Edition of Windows Server 2003/2008, purchase TS CAL's and your done...no need to buy a desktop OS and VECD licenses. It's significantly less costly."

The licensing point is well taken and is a major problem for other VDI approaches.