Web Conferencing Tips - Teaching

One of the biggest usages of a web based conferencing system right now is for teaching. I can say even for me the biggest use in my own web conferencing room is still teaching too. Having an online classroom really opens up who you can teach and takes away many of the physical limits of meeting in a "room" in some building. here is a video I found of an emerging web conferencing software that targets teaching and gives some great examples of what some people are teaching. Notice the people are from all over the world.

So is there something you should be teaching on in your own web based conferencing room?