I really liked the presentation itself. I've seen Prezi used very well once before, but this one was excellent. I wish I could have been have been there, but Leeds is a bit of a trek from Cambridge.
The most interesting thing for me (apart from the importance of the issue itself) was how easily I could follow the presentation remotely. Ned and Laura both blogged in the morning about the event and linking to the presentation. They used future tweets so that they could send out their talk in real time for those of us that couldn't make it (including a bit of the back-and-forth nature of the presentation) and called for our participation in feeding ideas back to the room. Now, admittedly there was a bit of a time zone mix-up that meant I got to read the presentation an hour before it actually happened, but in a way I think that's a good thing. Often there isn't enough time for remote followers to get their input into the discussion - having a bit of a head start meant that we had more opportunity to join in. The tweets have been archived using TwapperKeeper.
I think we all have a lot to learn from the way this presentation was organised. I'm definitely going to try their approach in future - although I believe Prezi is supposed to be very difficult to do well. No different from Powerpoint then. Oh, and I mustn't forget to tell the world what we actually do and try to become another echo chamber escapee!