Waze (blog) is using mobile phones as sensors to collect data. The Israeli-based start-up (though now with offices in SF) is relying on users to create its maps, to report realtime traffic and to teach it how to route from place A to place B. Along their drives the user gobbles points for every action. Use the app and gain recognition within the Waze community. The company is doing all of this through its free turn-by-turn navigation apps (sorry, iPhone and Android only for now).
Waze: Make Your Own Maps in Realtime - O’Reilly Radar