I'm not gonna talk about a certain session, but want to give an overall feedback. I've only attended a few sessions and workshops, but over all it seemed a little too basic sometimes. Some speakers used up a lot of time to explain basic things like "What is Web 2.0", something that should be basic knowledge for people attending a Web 2.0 Expo.
Especially compared to the BarCamp taking place the weekend before W2EB some sessions were not made for specialists, but more or less for people who want to get an insight of what all this Web 2.0 is all about. I want to point out that this is just my opinion as someone who spends a lof of time with 2.0 stuff.
Since I was helping out at the Web2Open booth I often had to walk about five minutes to get from expo to the conference rooms. That was why I often decided not to listen to sessions because it was just too annoying and time-consuming to do it.
The whole room situation made it nearly impossible to meet people in a comfortable place because there simply was none available. I realised that when I found people using the Web2Open place to meet people, which is okay, but maybe a central place to meet and discuss would've also been good. Maybe you should consider having a central, yet a little more silent place for networking purposes. Because after all, that's what expos are also made for.