How about TED.com – It is an AMAZING site. I waste so much time there its not even funny. Basically they have professors, scholars, and experts in all kinds of different fields, give lectures on just about any topic imaginable. The idea of the site is pretty much to just share really interesting ideas and information to anyone who is interested in hearing about them. It should be right up your alley. PS Im in no way affiliated with TED.com – i just love the site!