-MongoDB talk is a great intro and the auto-sharding information was news to me.
-Introducing EDD is a talk mostly about A/B testing and making it more core to the development process. Very interesting stuff.
- NoSQL was a good intro do various non-sql databases.
- Polishing Ruby Gems - essential if you are a ruby developer, points out lots of issues with how developers are handling gems.
- Worst. Ideas. Ever - Great fun.