I'm looking for a cheap but reliable solution for conducting virtual classes. The chief requirement is text chat and audio, but other features like a whiteboard, video etc may not hurt. I'm aware of Elluminate (which is not free), and welcome ideas for alternatives.
Check out Dabbleboard and Twiddla. I believe Twiddla has a voice chat option. You can find links to both under the Team Whiteboard section on my website. mrholshoe.com
Allows you to mashup audio, video, and images into a broadcast. Have them share their broadcasts by mail, embed it onto our web page, or post it in their bog.