I’m a big fan of EconTalk.
It’s a podcast that “features one-on-one discussions with an eclectic mix of authors, professors, Nobel Laureates, entrepreneurs, leaders of charities and businesses, and people on the street. The emphases are on using topical books and the news to illustrate economic principles. Exploring how economics emerges in practice is a primary theme.”
Here is an episode on a topic dear to me, that is the effects of population growth. Needless to say, I side with Simon’s camp on this one.