One of the best things about openstreetmap is that I havn’t got a clue what everyone does any more. Once upon a time I knew everyone involved but now with over 1800 users things are just too big. Sxpert put an underground OSM demo at the X.org stand at LinuxTAG, you can see pictures here. I wonder if Matt realised his logo would show up all over the place. The tag line is very nice ‘free map data for a free world’.