The use of ConferenceXP for this is one possibility. David Mycue has a server up and running. It may not be a long term solution since it is a Microsoft experiment and isn't slated to be product.
David is also bringing up a Cisco MeetingPlace server for evaluation.
Need to meet with Steve Lerman and David to better define how SMA would use this and what we hope to learn from the experiment. Cisco is also interested in doing a case study involving SMA - though that may be dependent on our using the Cisco product.