Dave Winer has many cool tips to organize a 2.0 conference aka unconference.
Once you’re in you’re spoiled. I’ve heard it said many times, by people who had a real unconference experience, that they can never sit in a dark room, with their hands folded, waiting for the Q&A period, listening to a PowerPoint presenter drone on and on, while the heads bob up and down and a dull roar of enthusiastic discussion can be heard in the distance, in the hallway.