I was talking to a friend in the conference business about the tools I am seeing being used at some conference and many of them are making a lot of sense to me. I think we are on the cusp of a new era of event services. That allow the attendees at the event to share their views and build a site that continues the benefit from the event.
Take a look at http://www.enterprise2conf.com/about/what-is-enterprise2.0.php as an example.
It has a wiki, blog, social site, Facebook Group, and a newsletter. Thats a lot of focus.