In March we will be putting the new OpenSuse 10.2 server live to our thin clients, with support for 3D/Compiz.
Federico is always very cool about me bouncing off him the odd things we sometimes see when running hundreds of concurrent GNOME users on the same server. I found such an issue, and have come up with a work around. When you have around 30-40 people logged into one server, and push live a new .desktop file the whole computer gets very slow as all of the application-browsers are updated at one time. The presentation freezes for all users for about 4-5 seconds while everyone updates. The more people on the server, the worse it gets. In case anyone is interested in improving this situation, I have snapped a screenshot that shows it happening. In the gnome-terminal window I am just duping an icon to simulate a new program being added. In the "top" window, you can see the CPU hitting 90% and all of the application-browser processes appearing at once. This sample was done with about 50 people. When I put on a full load next month, it will be far worse. The work around is low tech; icons will be added only at night when no users are on. :)
I'll say it again, all of this technology is working extremely well. This one small issue is hardly a show stopper.