If you're interested in listening to some really fascinating lectures, check out the Long Now Foundation podcast. The goal of the Long Now Foundation is to promote long term thinking -- where long term is on the order of 10,000 years. They've rounded up some really fascinating people, including Peter Diamandis (the X-Prize founder), Brian Eno, the Dyson siblings, Bruce Sterling, Ray Kurzweil, and dozens of others.
There's around 50 lectures currently available. Definitely worth checking out.