See this links, could be very interesting
http://osflash.org/red5 -Open source flash server
http://www.dimdim.com/ - Free flash webmeeting server (with client too)
http://www.123flashchat.com/ flash webmeeting too, but easy to integrate with moodle (not free above 10 simultaneous users)
Chat
Request for a -Live Presentation- Module
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