The guardian mentions openstreetmap,

http://www.guardian.co.uk/technology/2009/oct/28/3d-world-map-internet

A guy has created a 3d virtual world using openstreetmap data :
http://www.victorkeegan.com/Victor_Keegan/Creative_technology/Creative_technology.html

Video here :
http://www.youtube.com/watch?v=4tVcAuNpgk8

Twitter :
http://twitter.com/vickeegan