Ok, now here we are with augmented reality, it is starting. We have the tools like webcams and Actionscript and in flow the impressive examples.
It’s done by James Aliban, an artist-developer-scientist who likes to experiment and build stuff with all sorts of hardware and flash. Here is how to build a multitouch screen very easily on your own. And he has many more examples.
Update: Thanks to Konrad here is another augmented reality example by GE