BBC World Service has an audio-documentary out on street art. Of course, it’s an AUDIO description about a VISUAL medium, so there’s that problem, but I’ve just listened to part one, and it’s quite good (given you can’t see anything that they’re talking about). The program heavily features Elbow-toe, but also also includes interviews with random members of the public, and even people the people who buff graffiti in New York.
More info on the two-part series here, and you can download part one here (part two goes online tomorrow I believe).