A few days ago, top GPS companies in the world announced that they are developing their own GPS kits for iPhone. Garmin and TomTom both have dominated the PND market, but thanks to the latest upgrades to iPhone, you can get the same navigation features on your mobile device. TomTom for iPhone Kit includes an iPhone app and a kit (w/ mount) to let you turn your iPhone into a fully-fledged GPS:

You get hands free calls, turn by turn directions, and text to speech functionality on your iPhone. Not a bad way to replace your goold old GPS. Another reason to wait for the full release of iPhone 3.0 OS.