Nike True City is a really cool iPhone app where you can find some info about different european cities, provided by some "Nike experts", but leaving it open for you to update the content with your own suggestions of what a "true city" should be.
Aditionally the app reveals where new Nike events are taking place, where there are secret QR-codes in each city (i love they include even a QR-Code reader inside the application) or even new Nike products to be launched, creating a really interesting community where you can be rewarded on your own or by sharing to the rest of users. Here's a little trailer to the app:
