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http://www.adobe.com/products/acrobatconnectpro/webconferenc...

According to this, it supports up to 80,000 participants.

Having looked around for a similar product, Adobe Connect Pro seems the smoothest so far. The Flash/Air install is fast and easy. I'm not completely in love with how the window ("pod") management works, but it's not the horrible suck that is WebEx.

Microsoft LiveMeeting is so so (better than WebEx IMO), supports hundreds of users, and is very cheap. But, it requires a big Windows client. Their Java client is lacking basic features, like VoIP.

We also have had good luck using Acrobat Connect for screen sharing between 3-8 parties. It was a unstable on Mac a couple years ago, but they seem to have ironed those problems out.

I have had great experience with Acrobat Connect. I have mostly used it for small presentations and even some one on one.

At the time it was free for the level I was using it.

We have used Connect Pro with more than 100 attendees.