I'm assuming all you Americans out there are already massive fans of This American Life. If you're not, what's wrong with you? But for all you non-Americans, you should know about this programme. Because it's, simply, the greatest radio programme ever. Even better than In Our Time.
They've got their entire archive online, and you've been able to subscribe via audible for ages. But now they're doing free podcasts - you should subscribe.
Some of my favourite episodes are these; about telephones, about 24 hours at a diner, about classified advertising (featuring Jon Langford from The Mekons), about experimental phases, and this one, about prison. Which I think is the best single hour of radio ever. Make sure you listen to it through to the end.