I've listened to the following two; both are very good. Kenneth Miller gives a good lesson in evolution, as well as, interestingly enough, some of the better aspects of Catholic theology.
Os Guinness does a good job convincing the listener that perhaps 'thinking Christian' is not an oxymoron after all.
Kenneth Miller, Professor of Biology, Brown University
“God, Darwin, and Design: Creationism’s Second Coming"
Os Guinness, Theologian & Author; Co-Founder of The Trinity Forum
"A World Safe for Diversity: Living with our Deepest Differences in an Age of Exploding Pluralism"
There are also lectures by Richard Dawkins and Judge John E. Jones that I haven't listened to yet. There is also a lecture by Michael Behe for some reason. He certainly seems the dim bulb in the group, but I haven't listened to them all yet.