AronRa (http://www.aronra.com) has spoken on behalf of skepticism and freethought for many years, and his Magic Sandwich podcast has been heard by thousands across the globe.
Aron talks about his own journey, his studies on the "theory" of Evolution, his battles against the teaching of Creationism in public schools and more. Plus your questions and comments.
Available on iTunes.
And at BlogTalkRadio: http://www.blogtalkradio.com/thethinkingatheist/2012/02/01/youtubes-aronra-and-your-calls