Living in the IW World, when I read time ago about Tahiti project, Tahoe (SharePoint v1 CodeName) came to my mind... Tahiti is now SharedView Live Project.
I really like the top bar with the menu. When you start a session, you receive a message in order to accept the request. You can share an application or whatever you want, and it works really well.
Mini-Groove_LiveMeeting-adBased :) you should try it.