They're all online now. As said before, I've recorded the demo's I did during the OCS R2 RoadShow, the OCS R2 TechReady events in the Netherlands, and the OCS R2 Ignite Trainings, and they are now available as Microsoft Belgium Chopsticks . If you miss any demo, do not hesitate to let me...
In OCS 2007 R2 it is fairly easy to block certain clients from connecting to OCS, just like in OCS 2007 R1. But the nice thing included in R2 is that you can configure your OCS environment to automatically update clients that connect using a wrong version to an allowed one, using the built-in AutoUpdate...