I have come across some truly inspireing Ideas using some fancy (but simple) 3D software to let you interact with an object using a piece of paper and a camera. I’ll let the videos speak for themself. They are in German, but you don’t have to know German to understand the awesomeness.
We tried that Ford Ka example in the office. One of the guys downloaded the software to his Nokia. It works so easily, and its totally fun to interact with. Just point the camera at the paper and the car appears.
3D Fun for Everyone