Tomtom's GPS navigation system works on iPhone

According to msnbc who's quoting a Tomtom manager, the compagny already has a GPS navigation software running on the iPhone.
Before they release the app, they certainly want to study Apple's strategy in order to negociate the amount of incomes Apple gets from the Appstore downloads.
There's no doubt a turn-by-turn GPS solution would add a great value to the iPhone, and big developers such as Tomtom's might want to give a try on bringing the Appstore 30% profit margin down.