GPS apps have been around long enough for the iPhone that they’ve become pretty commonplace. They’re no longer sold (or bought) simply because they are the only ones available, so new features are what keeps the sales coming. Navigon’s newest feature is another first for navigation apps on the App Store: live traffic data.

Ever since Apple added GPS as a feature of the iPhone 3G, consumers have (wrongfully) assumed that this meant turn by turn navigation. Finally, Apple is now allowing turn-by-turn GPS navigation apps on the app store with iPhone OS 3.0 and above. And it didn’t take long to find a real winner in this category. Navigon’s MobileNavigator is a superb choice for turn by turn navigation, even without waiting to see what others will produce in the future.