Chris Brogan, with whom I've spoken in the past about the use of wikis for collaboratively creaing and sharing corporate documentation, emailed me about the Podcamp Boston website, built and maintained using PBWiki.
While this is certainly not the first time someone has used a wiki to manage conference related information, Chris' example is a good way to show how flexible and easy to use such tools are. Check it out.
Good luck with the conference, Chris!