virtual auditorium

• the stanford virtual auditorium -
  a videoconference system called the Virtual Auditorium to support dialog-based distance learning. Now known
  as the stanford video auditorium.
  
• c6 virtual reality room - a
  cave virtual reality system. this particular system is
  based on mechdyne hardware.
  
• du- diversity university combines the web and moo/mud tools to bring a collaborative environment.
  
• virtual environments international -
  offers the virtual conference system supporting slide presentations, audio/video, q&a, moderation, chat, who's online, whiteboard, ...
  

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• think of it - a guide to web based conferencing maintained
  by David Wooley.