Check our extensive discussion on educational IRC conferencing . This technology is fairly new, so tolerance and patience are important. If you want to share live images and sound, you need a digital camera, an AV computer, and conferencing software such as CU-SeeMe. You can hook a camcorder directly into an AV computer, increasing the quality and range of your broadcast. But the audio can be pretty choppy.
Some folks like to use a telephone conference for when the audio is going to be extensive.
Information and software is available from CUSeeMe Networks .