One of my favorite sessions from the Web 2.0 Expo happened to be only 5 minutes long and was during the Ignite opening event. It was really neat because they had more than a dozen speakers and gave them each 5 minutes.
Salim Ismail (Yahoo!, Confabbb) provided what I thought was the most insightful, and definitely most information packed 5 minutes of them all. The following four slides are from his presentation.
To view some of the other talks, visit the “ignite” tag on Viddler.
Update: Here are some other thoughts.