There's this show on Radio 4 called In Our Time that's concerned with the history of ideas. Each week Melvyn Bragg brings together three guests (serious guests at the top of their fields) and they have a discussion around the major themes. It's kind of awesome if you're interested in science or history... Starting from shortly after last week's episode, now you can download and listen to the whole programme in non-DRM'd, easy to understand, iPod (and other media player) -compatible MP3 format!
Finally my campaign is bearing fruit. Get that In Our Time Electricity episode now.