TomTom's much-ballyhooed iPhone GPS app best step its game up, else it'll get left in the dust by none other than Navigon. The lesser-known nav company today introduced the second major update for its MobileNavigator iPhone app (our impressions are here), and the feature additions aren't anything to scoff at. For starters, the program has become the first on-board navigation app for the iPhone to gain text-to-speech functionality, and just in case hearing street names belted out through a robotic voice ain't good enough for your high standards, the inclusion of iPod control should win you over. At long last, drivers can access the full range of iPod functionalities with a single click from map access, and it even recognizes the shuffle feature to keep you guessing. Finally, a location sharing function has been added to make stalking your pals that much easier; to close, Navigon has knocked $10 off the purchase price, bringing it down to a nearly-palatable $89.99 -- and yes, those who already own it can download the update gratis.