For what it is worth having meetings in second life were much better then the dial in meetings I have done for years. All sitting around in a circle looking at the person talking and the software easily handled many different people. Not sure if it also did direction audio or not, but I never had a problem knowing who was talking or make a gesture to know I wanted to comment on the current conversation.
Downside (maybe): half the people show up as funny creatures :)
Downside (maybe): half the people show up as funny creatures :)