http://undergroundvalue.blogspot.com/2008/02/notes-from-buffett-meeting-2152008_23.html
I believe Warren Buffett covered quite some popular topics here.
For example:
1. Diversification vs. concentration
2. What industry will be the next growth driver in the 21st century?
3. Is the Federal Reserve fostering moral hazard?
4. The nature of the ongoing "credit crunch"
5. The sovereign wealth funds
...