I recently discovered a fantastic video resource: Talks@Google. These are recordings of lunch-hour talks given by authors, politicians, social activists and so on at Google's Mountain View, California headquarters. The list of speakers is pretty darn impressive: Noam Chomsky, Hillary Clinton, Barack Obama, Christopher Hitchens, Salman Rushdie, Paul Krugman, James Randi, George Lakoff, Marco Iacoboni, and many more.
Anyway, embedded below (or click here) is Steven Pinker's talk about his book The Stuff of Thought. The talk is extremely interesting and seems to serve as a decent summary of the book: