Used to use Remote Desktop but moved to citrix's Xen Desktop with desktop hardware in the datacenter. That gives our desktop fully redundant power, A/C, network connectivity, etc and it's always available / accessible with full device access (think USB over IP). They even have a software client for ipads. It's cool technology, but the cost / benefit may be questionable. There is a virtualization benefit at the server, but we ended up dedicating resources since we're all very active information users and virtualization induced an unacceptable overhead for desktop experience.