If you're not familiar to the NPR show "Speaking of Faith," I would highly recommend checking it out. I've got it set up to download as a Podcast, but you can listen to it at their website, or (if you're lucky) get it on your local NPR station.
Every week is interesting, but for the purposes of this site, perhaps most interesting have been the two hour-long shows that have been done on Dietrich Bonhoeffer and Reinhold Niebuhr. These shows grapple with the complexities of both of these great theologians' thoughts, and try to put them in the context of their own world and the social crises to which they were responding.
The question for us, in listening to these shows, is what Bonhoeffer and Niebuhr have to say to us today, and what demands our own context and the social crises today put to us and our Christian faith. Thanks to Krista Tippet for these shows. Go check them out!