I don't think we need people running cameras per se. What about IChat or Web-Cams in sessions? What I am thinking is the session organizer can try and organize this for his/her session. If we have laptops in every presentation room, we could have IChat or Web-Cams with the laptop and projector. I don't think it is overly complicated (but I could be wrong).
things like netmeeting or ichat are pretty good for point-to-point communications, but pretty awful for 'broadcast-style' communications. if you've been around for a few years, you may remember the CUSeeMe concept of a 'reflector'. it'd take one or more of those, off-site, each with significant [meaning "a whole lot more than a home user is going to have"] available (both upstream and downstream) bandwidth, to handle a webcast arranged in this way. so this puts us right back at the "cost" issue again. bandwidth isn't free, and neither are network uplinks from conference venues. --elijah