The iPhone GPS app market unleashed by the release of the iPhone 3.0 software update is getting more interesting by the day, with several developers in an arms race to add new features to their initial offerings.

Taking the lead in the GPS app race is Navigon MobileNavigator, which recently added support for spoken street names—a major failing in the three apps that I previewed in a Macworld Video last month. My own in-car navigation box doesn’t even speak street names (other than numbered freeways), and it sure makes a big difference.

To read the full article about the new "Mobile Navigator" click here.