At yesterdays WWDC TomTom has announced to release their in car navigation for the iPhone (also for the new iPhone 3GS) including car kit for secure docking. The docking attaches to the windscreen and allows portrait and landscape mode.
The TomTom application including the latest maps will be available from the iTunes store soon they say.
Some first shots from the conference shown at engadget.
Lets hope soon, so that we can have a look at it. So far we have to enjoy the clip on Youtube:
See the TomTom announcement here.