I like to listen to talks while I’m running or at the gym. Here are a few recent ones:
Free software forever, starring Deb Nicholson. This talk inspired a lot of people, myself included.
A usability study of the GPL, starring Brett Smith. This also had a number of good responses. The description takes a stance against license proliferation, which I approve of.
Four ways of spreading the four freedoms, starring VM Brasseur. I’m cheating a bit, I watched this waiting in line for brunch one day.