He's been doing a book tour, stopped by Cambridge yesterday. If you're not in a place he's stopping by, check out the Authors@Google talk he gave: http://www.youtube.com/watch?v=lnq-2BJwatE

He makes some long-winded jokes for the first few minutes (mainly about authors being ill-suited to public appearances), starts talking about Anathem around 3:40, and starts the Q&A time around 8:30.