After several recent posts about the pitfalls of back channel communication at conferences I was pleased to find that someone has written a practical guide to this area. It's called The Backchannel Book and is a community wiki full of information on the various tools you can use (Twitter, Jammer, various IM tools, document sharing etc.), how to use them and related articles.
One page in particular that caught my attention with regard to the recent reports of Twitter heckling and disruptive behaviour, is the Backchannel Agreement. This is a list of guidelines outlining a conference code of conduct aimed at organisers, presenters and participants. A very relevant checklist for any conference and, with some adaption, the base of a code of conduct for any class as well.