I have tried for a few hours to find a site where we can do a live broadcast--It seems that what I want is the capability to do the type of things that can be done with http://www.netbriefings.com/proclaim/
yet we need to be able to do 60 minutes of the conference at a cost of free to 10 cents a minute per participant. I expect 100-500 participants.
The alternative is to use a service like Ustream.tv which seems free, but I do not like the quality of the broadcast and I cannot figure out how to use my monitor which will have better quality and the slides for the upstream. the audio of the call in could be handled by a conference call system with audio heard via speaker phone and a mike pick up. but I do not think ustream is the answer
If we have to we can do it without a live hookup using http://www.fliqz.com/aspx/packages.aspx
which allows the use of pop up video within the web browser for as long as needed. other video services limit video to under 10 minutes.
Could you come up with something that is similar to netbriefings, with high quality and less than 10 cents per minute per participant and a 60 minute limit, or a solution that would accomplish the same goals?