Yahoo! Hack Europe: London - Grand Prize Winner and FirefoxOS Winner: RoadBuddy

Road Buddy is a mobile app that makes your travels safer. Use Road Buddy to pull up your route, and you’ll also see crime hot spots in the area, which Road Buddy can reroute you to avoid. This is, of course, useful in large cities, but imagine how important this can be when you are traveling, or if you live in an area where crime is rampant. This app used several APIs, including YUI and FirefoxOS.