He started by saying "The best part of these thing is the Q&A period, so that's all we're going to do." Unfortunately, since most talks have some content, none of us were prepared for a solid hour of asking him stuff.
The only really noteworthy bits were where he backed away from the libertarianism of some of his earlier books, saying that terrorism does make having states look like a really good idea, and defending his style of closure. Most of his books don't so much "finish" as "end", and that puts some people off. I'm willing to accept it, since frankly life goes on and something else will happen next. He did specifically point out that the end to The Baroque Cycle was lovingly done and does tie up damn near every thread that I can think of.
For showing up, work gave me another copy of Snow Crash.