Paris Metro is an augmented reality and mapping application for the iPhone and iPod Touch. The application is a guide to the Paris metro, a route finder and a hell of a lot more.
The video below (in French) shows how the augmented reality function can be used to find the nearest Metro station and other points of interest.
The application is fully integrated with Google Maps. It is possible to locate the nearest stations at any time directly from the Google Map. Each station is represented by red map markers and distances are updated in real time via GPS.
There is a lot more to this application, such as Paris bus routes, nearest restaurants POI, cafes, bakeries etc but I guess it is the augmented reality function that really catches the eye.