These three poscast/radio programs are all produced by Public Radio International (PRI) and they are among my favorite English podcasts.
To the Best of Our Knowledge
This podcast features interviews with authors writing on fascinating topics from CIA's "economic hitman" to natural foods, from craftsmanship to slave pottery maker and poet, from scrapbooks in the early 20th centry to the "Jazz ambassadors" during the Cold War... Didn't know I'd be interested in such a diversity of topics.
Web add: http://www.wpr.org/book/
iTunes search keyword: PRI
The World in Words
I know I'm a geeky language student, but this is truly an interesting podcast by any standard. It's one of the programs of the World series and talks about topics related to languages and society, politics, psychology, learning... It's funny, informative, and gives you something to reflect on. Highly recommended!
Web add: http://www.theworld.org/the-world-in-words-podcast/
iTunes search: PRI
Selected Shorts
The episodes are recorded live at the Symphony Space in New York. The readers are often professional actors and the short stories are selected from a wide range of authors. It's now my private bedtime story reader.
Web add: http://www.symphonyspace.org/shorts
Or search on iTunes
Cheers!