I was originally all for Xenserver support in a previous post - however - After a short few months on Xenserver, We have since switch to VMware for our Xendesktop infrastructure. We already used VMware for our server virtualization and found Xen to be not even close to the VMWare functionality and to have a huge learning curve compared to VMware. Simple tasks in VMware required too much research for Xen.
Personally - I can't stand Citrix after working with it for a while now. The Xendesktop user experience is by far better than View but the huge costs of a Citrix support agreement combined with the lack of finding updated and useful documentation ..... I'll take the best of both worlds.
This topic is off my radar!