There's going to be more variety of navigation software for the iPhone than any other portable platform in history.

The built-in Google Maps does turn by turn according to Apple's web pages. It just (supposedly) doesn't do route re-calculation. It's not meant to compete with something like TeleNav or Tom Tom's nav though. Both of which are also coming to the iPhone.

I'm just waiting until I can get a phone while screwing the operator selling it - ie. without contract or breaking contract while retaining price close to advertised "retail." Then it gets jailbroken and unlocked so I can use it with any SIM and subscribe to a Pay as You Go plan here in Canada - likely without a cellular data plan.

I'm still really wanting one with 200GB of storage though. Not to mention a 4 or 5mp camera that can also shoot video clips. Might as well double the battery life while we're at it. A way to connect it to a compact flash card or other camera to unload photos would also be cool.