Free Lectures From Around the Web

I just stumbled upon a very interesting Web site: listeningtowords. Here's where you can "find, listen, and discuss free lectures from around the web."

At first glance I see:

A Scientist in Space/Searching for Earth-like Planets: NASA's Kepler Mission
by Janice Voss @ Astronomical Society (2007-03-07)

Glimpsing the Edge of the Universe: Results from the Hubble Space Telescope
by Bruce Margon @ Astronomical Society (2007-01-24)

The Planet Pluto: Maligned but Not Forgotten
by Dale Cruikshank @ Astronomical Society (2006-11-08)

Dark Energy and the Runaway Universe
by Alex Filippenko @ Astronomical Society (2006-11-04)

Estimating the Chances of Life Out There
by Frank Drake @ Astronomical Society (2005-04-20)