Leser: 19
Quote* Support for up to 20 attendees for free
* VoIP support for up to 3 speakers at once
* Both public and private chat is supported
* Sharing PDFs and PPTs
* Sharing websites
* Whiteboard support with everyone editing simultaneously
* Mac and Windows can share their desktop
* All platforms can see the shared desktop
* Supposedly the system can record the session (I haven't heard the
playback, yet.)