The results are pretty informative. Many of the respondents to Question 9 are using Multisite.

I wish I could be there. Sadly their live stream required MIcrosoft Siliverlight to watch. Which I just won't bother to install.

If organizers from WPCampus reads this. Please don't DRM a live stream when it's not necessary I'm sure it hindered your viewership of the event.