Auf dem 24c3 letztes Jahr gabs übrigens einen Vortrag über Openstreetmap. Das Video dazu gibts beim CCC-Chaosradio.
„This talk intends to give an overview about the technology, the methods and the community behind OpenStreetMap, explain what we’ve achieved so far, and of course why OpenStreetMap is twice as cool as anything you can buy for money. In true hacking spirit we will also demonstrate a few rather unconventional uses of our data.“
(24c3, OpenStreetMap, the free Wiki world map)