One thing. Currently you only basically have web programming talks in the system. Your site name implies that there would be every talk, not just programming talks.

I would also like to see the talks categorized little bit more better than just Featured, popular, recent, events.

One good thing would be to let users to submit talks into the system, which would free your time from finding talks which actually do not interest you personally.

Terrific idea. Beautiful web design. Awfully executed, because I think you built this for yourself and not for others.