Maybe one of these days I'll upgrade my computer and be able to do more than load poser and brush my teeth at the same time (slight exaggeration). I know it could be done if everyone has the right set-up. At work, we played with a colloborative planning system. Once during a test, had about 1000 folks hooked up. And to really put it to the test, they took all the phones out! As I recall, they used NetMeeting as the backbone (with a bunch of code laid on top of it).