On a different related note, the maps integration could be extended to contacts; we know where they live, at least by address (and why shouldn't we be able to geotag our contacts when we visit them?). Isn't it the most natural thing in the world to integrate that information with a map application?
* Get a map thumbnail of their home in a contacts application
* Click the thumbnail (or a button) to bring up a map application focused at their home and/or work
* Click a button in a map application to bring up an overlay with all our contacts' names and "profile pictures" at their home and/or work
* In the map application, browse to one of your contacts, click and get to their details in the contacts application.

Oh, and about the use for photos linked to contacts; you could not only easily recall who that person in the photo was and how to reach him, in a contacts application you could directly see which photos you have associated with each person and for instance from those pictures have a natural selection of profile pics.

Is it just me or does this make perfect sense?