I just found this draft from 3/27/2009. I don't remember the specifics of what I wrote here but I will post these rough notes. Hope it helps!
We started using ustream.tv instead of justin.tv. We could not get the XH-A1 Video Camera to connect to the firewire port on the Windows laptops and then we found camtwist for the Mac which is very nice for controlling the video input. Almost anything can be used as a video input.
viewers not having to login to access the integrated chat and can set their own name in the chat
the ability to change audio and video inputs without stopping the broadcast, of course CamTwist now fairly well covers that for the video
I just discovered the ability to type text as an overlay onto the video screen, very on the fly, I used it as a replacement for streaming the pp slides with the camera feed