Stanford has a weekly speaker seminar class called Entrepreneurial Thought Leaders that has a free podcast. (You can't see the video unless you log in as a student, but hopefully that will change in the near future.)

Not all of them are great, but there's enough that you're bound to find a topic/speaker that you're interested in:

http://ecorner.stanford.edu/podcasts.html

(Past speakers you might be interested in: Marissa Mayer, Reid Hoffman, Mitchell Baker, Mitch Kapor, Ron Conway, Sue Decker, Larry Brilliant, Vinod Khosla, William McDonough, Mark Zuckerberg, et. al)

(Also, I highly recommend David Rothkopf's talk if you're interested in policy/current affairs/the world.)

edit: I guess I should add that I help out with the class, but I'd have posted this either way :)