My friend Chris Avis wrote this:
If by chance you have not heard of Roundtable, check out this post by Carl Tyler. Now that you are back and itching for more, I will save you the time in searching the Microsoft site. There isn't anything there. A few press notices and a passing reference on a Unified Communications site. The two video's show it better than anything else.
I remember seeing a proto type of something like this a while back. It brings a whole new meaning to conference calls.