Radio 4’s PM programme is asking listeners (via its iPM blog) to send in their postcodes as part of a mapping mashup experiment. The postcode should relate to the listener’s location when the shows on air.

More details about the project will be announced on the show this week. But even if it’s just a straightforward Google maps mashup of where the programme’s listeners are, it’s a handy way for the producers to track the reach of the show and maybe target areas where the audience is not as strong. All this and it gets the listeners involved.

UPDATE – here’s a link to the listeners’ map