http://ustream.tv UStream.tv may be a N.E. USA-based web service. UStream offers FREE and for-a-fee one-way video conferencing service to anyone who registers on their site to use their service. The free service includes commercials which all your video stream users must suffer to view and hear. The registered user, assumed to be a presenter with a web camera, schedules a "presentation" or "performance". Would-be audience members sign up for the event and probably receive 1+ email warnings that the event will start "soon". As of Aug. 1, 2010, this investigator does not know what is the maximum number of simultaneous online audience members allowed in one video conference event, nor if 2 or more "presenters" (also called discussion moderators) are allowed to use their home-office web cameras and microphones to present themselves, their speaking, and any "additional materials".