Suggestion

You should listen to this really fantastic radio show out of New York. It's called Radiolab, and it's an hour long show that combines science with culture. It's got a really interesting aural athestic, in which people frequently tell the same story over each other, and sound runs underneath almost every part of the show. It's hosted by two men, and they play their parts like they're having a casual conversation that's incredibly interesting and happens to have sound bits. It's more transparent than This American Life. I'd say it's investigative where This American Life is narrative.

I recommend starting with Detective Stories.