I’ve been impressed by the creativity of the art museum world in their use of podcasts. I think that it stems from their familiarity with the recorded gallery tour, in which you picked up a cassette player at the entry desk and walked through an exhibition, listening to the curator. Take a look at SmartHistory (http://smarthistory.org), an award-winning site that uses a format of two narrators discussing a particular work of art. For a good example, check out their podcast on Mary Cassatt’s “Breakfast in Bed.” It is very low tech and focuses completely on the painting itself. I have not found the same level of energy for the interpretation of history, although this is rapidly changing.