http://www.theregister.co.uk/2009/11/26/waze_pac_man/

Waze isn't the only crowdsourced mapping project - OpenStreetMap is also trying to map the world using GPS-equipped volunteers tramping about the place recording details. Waze is the only one who offers virtual rewards to those who take the time to visit badly-mapped places, however. OpenStreetMap hold parties there instead.