Having had a couple of days to reflect on my experience with ConcertChat on Monday, I continue to be fascinated with its' potential. I am particularly intrigues with how it could be used to get new material out to teachers. I know my interests are kind of out there but I am convinced that the new technologies are making a lot of important mathematics accessable. Here is an idea. What if I were to run a once a week on-line course on 3D mathematics for high school students or teachers using ConcertChat supported by you, Cabri and some CAS. Whoever took the course would be given the software by the provider. This might be a cool way to make new mathematics available. Just a thought, but I found using ConcertChat as a commiunications medium and SnapZPro or its' equivalent as a vehicle for tutorials pretty easy to master. If you have any interest I'd be glad to pursue this with you and other interested Forumites. Thanks again for putting together an interesting week.