http://community.citrix.com/display/xd/independence
http://www.citrix.com/English/ps2/products/feature.asp?contentID=2300345
http://www.citrix.com/tv/#videos/2044
http://www.vmwareinfo.com/2009/02/citrix-xen-based-client-hypervisor.html
http://www.citrix.com/English/ps2/products/product.asp?contentID=2300325