I just recently started listening to this program; it reminds me a lot of a program that Chicago's public radio station used to produce called "Odyssey" - wide-ranging, as detailed as possible in an hour, and with actual experts on the subject. I really missed "Odyssey" when it went off the air, and this is a very welcome alternative.

The shows Fougasse linked to above can be found in podcast form in iTunes. Search the iTunes store for "In Our Time Archive" and you'll find old episodes, sorted into the categories of History, Science, Culture, Religion, and Philosophy. You can also subscribe to the current series podcasts by just searching for "In Our Time."

Just when I thought I had finally brought my podcast backlog down to a manageable size. *sigh*