There is another solution that provides and un-compromised user experience and that is PC-over-IP (PCoIP) technology.
To be truly cost effective a Zero client needs to be able to handle any user type in an enterprise – from terminal/task workers, mainstream office users and power users that may require full DVI resolutions and full frame rate 3D graphics.
Check out this Zero Client that is an all-in-one display that Samsung just announced (SyncMaster930ND) it supports VMware View (aka VDI) and PCoIP to be forward compatible when Vmware VIew integrates PCoIP technology (see vmware announcement with Teradici at the Sept08 Vmworld)
Here is a demo of the user performance including HD video and 3D graphics. http://www.youtube.com/watch?v=HzGmwNIpFG4
Also, this flash overview from Samsung
For full disclosure, I am the Director of Business Development at Teradici. email@example.com]]>