At the booth, I demoed FLARToolKit. FLARToolKit (source code) is an AS3 version of ARToolKit. ARToolKit was a C library that enabled augmented reality; however the Adobe Flash/Flex/AIR compatible version, FLARToolKit, is not merely a port of the original C version. FLARToolKit is ported from a Java, version which is called NyARToolKit. (NyARToolKit seems to execute much faster than the original C version after the great effort of nyatla.)
FLARToolkit will detect the marker from an input image and calculate the camera position in three-dimension space. Something like Helper library are planned, but further processing (like synthesizing the 3D Graphics) needs to implemented by yourself. You can try a demo of it here at General Electric.
While at the booth, we got awarded the "Best in Show" award from Web Professional Minute, sponsored by Peachpit Press. This image links to the video.
My colleague Lee Brimelow took the concept one step further and has now produced an excellent tutorial on how to use the FLARTookKit for AS3 (Flash/Flex/AIR) developers.
If you haven't seen Lee Brimelow's GoToAndLearn website, it is a must see.