Will the iPhone Kill Standalone GPS Navigators?

The iPhone comes as close as you can get to a universal, do-everything device. It's as much a personal media player, translator, Internet tablet, notepad, alarm clock and a dozen other things as it is a cell phone. But with the introduction of the very first turn-by-turn GPS apps from companies like TomTom and Navigon, I think we're finally seeing the miracle device stretched a little thin. @ Digital Trends