iPhone can be use as GPS today but you will need something to hold it in your car. Check out the TomTom for iPhone. It was announced at the WWDC 2009 too. This TomTom car kit gives you the secure docking, enhanced GPS performance, clear voice instructions and hands-free calling, while charging your iPhone at the same time. The TomTom app + maps will be available at the app store soon. Video after the jump.