Phone based navigation systems are one of the great innovations of the early 21st century. But they have their drawbacks - like when they take you down a road dead-ended by construction. Waze seeks to improve on the greatness by tapping into real drivers driving real roads. Put simply, it's a community-based navigation and traffic app. So when a waze user sees traffic or other obstacles, they tell the app, and the app tells all the other drivers. It's a fluid, continually self-updating account of the roads as they actually are. Available for Apple devices (iOS 5.0 and up) and Android (2.2 and up).