On the wiki, you can read notes from each of the sessions (say, Ajax, a case study on Wells Fargo’s content efforts, and field research), find attendee’s weblogs, learn about jobs in the DC area, birds of a feather discussions on intranets and cultural change, and photos from Flickr.
It’s worked out… pretty good. Not great (it’s not clear *when* you should use the wiki, not everyone has a laptop, etc. etc.), but I think for those who have used it, it’s been pretty beneficial.