I have been working with Thin Client technologies on Linux for years. Recently however advances in sound in Linux are promising low latency performance necessary for VoIP for thin clients. Still I'm working to see these benefits where I work. I'm looking to see applications like GizmoProject.com work over Nomachine.com's client technology from a knoppix cd against an Ubuntu 7.04 terminal server. I'm seeing some momentum but it's not quite there yet.
I'd also like to see Wine be able to use the audio card of a thin client to use headsets for voice recognition software.
Well these are thoughts. Maybe someone will find them of interest.