This is one of the applications that I have on my iPhone. I find the application cool (also I cannot afford one :)... ). The application starts with a working animated Lange Zeitwerk. You can even change and see different colour dial and material used. You can view the back of the watch and even zoom in to view the movement. Best of all, you can virtually take the movement apart.
There is also the normal functionality that you find with this type of application. There is the dealer locator, view of the current collection and even request a catalogue. If you sign-up with Lange, you will get updates and news via the application.
Views of the application:
The start page. Tapping the icons on the bottom left corner, changes the watch.
Detail view of the Lange Zeitwerk movement.
The current collection.
And if you register, you will get updates and messages from Lange.
Photographs: iTunes/ A. Lange & Sohne