I recently able to help the Southern California DotNetNuke Users Group to host a virtual presentation by Shaun Walker the dotNetNuke projector founder. We used Microsoft Live meeting to project Shaun's slides and show is real time demonstrations to the group in Buena Park, CA while he was at his home in Canada.
To get all the information about the meeting and how you can view the recording go to Michael Washington's blog post entry about the meeting on the dotnetnuke web site.
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.