If you are curious about those web-conferencing products that allow participants to chat, write on a whiteboard, share desktops, and the like, you can download a free version of Elluminate Live, limited to 3 participants. I think it’s a good way to see what it’s like to moderate such a session. I see this limited version useful for office hours, tutorials, or collaborating on documents in real time, but when you all can’t get together.
I’ve tried it with Sara, even though she’s just on the other side of the office, and it works pretty well. There was some lag in a video presentation, but participants wouldn’t be aware of that, as we were. Still, for free, it is a good way to see how the technology works. Of course, they have more advanced and more costly products.