The 2 OS-level (as opposed to app-level) features that are better in Android are the widget-customizable home screen and the notification panel. But yeah, this is probably the first killer feature.
This map, though, looks like it could be part of the iPhone default apps.
I think Apple's recent acquisition of Placebase, a mapping company, might indicate that they're willing to compete with Google on a navigation app.
I agree on the keeping it simple part though. No need to make everything customizable when you have people that can make things more beautiful than you can. Sure, you can customize your version of van Gogh's Irises, but why bother? :-)
Would you buy a computer that couldn't be customized?