TomTom is coming to the iPhone (3GS)
Apple and TomTom announced an iPhone App (this summer) that will put the power of TomTom in the iPhone.
This looks awesome. A solid transition from the TomTom hardware and software to the iPhone along with some TomTom hardware to attach the phone to the dashboard or windshield. Consider this if you are looking for a take-a-long GPS solution.