I recommend you take a look at WiZiQ's virtual classroom.
Mark Cruthers
Link to March 17 Demo Replay.
http://www.wiziq.com/Replay_Session.aspx?key=t&id=73125
WiZiQ is an online teaching platform, which provides a free virtual classroom environment for teachers to interact online and teach students in real time. Teachers can also build a profile, keep an availability schedule, and maintain a content library, which is associated with their profiles, by uploading PowerPoint presentations and PDF Files.
Works in Flash format and needs no downloads
2-way live audio/video delivery
Whiteboard with Math tools
Synchronous Content sharing such as PowerPoint (retains animations and transitions), PDF, Flash, MS Word, MS Excel files and videos
Records all sessions to be played back in Flash format (needs no downloads)
Share PowerPoint presentations asynchronously even with narrated audio in slides
WiZiQ's Blog http://wiziq.typepad.com/
Feedback from Nellie, English Teacher
http://www.youtube.com/watch?v=m7sJ-RsWMI4http://wiziq.typepad.com/wiziqcom/2007/12/collaborating-o.html
Wiziq YouTube Presentations:
http://ww