We checked in around 8,300 attendees — see Jen Pahlka's write-up — with no queues and little waiting for anybody. At its peak, this was about one person every ten seconds.
Additionally, Web 2.0 Expo used Expectnation's new attendee networking features, and we've seen a great stream of comments and interaction on the site. I'm looking forward to building on these features to further improve the conference experience.
A happy thing.