Conference Collaborative Filtering

Also, some collaborative filtering for conferences would be nice. It would be interesting to know if there were other people at a conference who happened to attend all of the same panels I did on a certain day. Then it would nice to see which panels those same people were thinking about attending the next day. And then some way to contact them to talk about meeting. Stalking implications aside, I think this would be very cool as long as the users themselves are controlling what information is public.