Well, it seems the built-in Map application will in fact do turn-by-turn directions. The software implementation isn't a stand-alone GPS killer in its current state for most people though. At least it doesn't look to be from Apple's own web page on the subject.

But here's a nice article from Popular Mechanics on the then speculative features of the upcoming iPhone. It features the choice nugget I alluded to earlier:
Quote:

I recently sat down with the president of a GPS navigation system manufacturer to ask him how he felt about the prospect of a GPS-enabled iPhone. "Scared [expletive]-less," he said.


Anyway, what excites me the most is the development potential because it's practically set in stone this will be a prominent platform.
_________________________
Bruno
Twisted Melon : Fine Mac OS Software