NxTop is pretty cool. It is a hypervisor that installs directly onto the client hardware, allowing you to pull and boot pre-configured images over the network. The hypervisor removes the need for specialized drivers and supports dual monitors.
It also has the advantage over VMwareView of allowing the OS to sync for offline use if you would like to leave the office with a laptop. Sure VMware has it as an "experimental" feature now, but it is production with these guys.
They came and did a demo for us the other day, pretty cool stuff. I think it was affordable too. You can set policies for who gets what images, remotely disable a lost or stolen laptop, etc.
Check this out: http://www.virtualcomputer.com/About/press/nxtop-pc-management-launch-massively-scalable-desktop-virtualization-for-mobile-pcs