This was my first year attending the user conference, and I had a great time.
One way I think it could be improved though is by having some type of identification on the badges showing what industry you're in. Such as different shapes and colors. A yellow square represents one industry, a red square represents another, a blue circle represents another, etc. The key for these symbols and related industry could be in the handbook.
For example, I work for an electric utility, and I would have really liked to have a quick way to see who else is in the same industry. It would have made finding people who I'd be interested talking with much easier.
Anyway, just an idea that could possibly be expanded upon.