Last weekend I attended YCombinator's Startup School conference at Stanford. The speakers included Mark Zuckerberg, Joel Spolsky and Patrick Collison. Video from the talks are available.
For three nights I stayed at the Startup House in San Francisco and met hackers from all over the world. It's a bit like living and sleeping inside a filthy Apple store. Hackers, Macbook Pros, and dirty dishes. So much fun!