After testing Papervision and the Augmented Reality in Flex I have tried it into Flash Cs4 too.
But some weeks ago I also tested Flirt particles system, a cool AS3 library to generate nice particles effects in Papervision 3D.

Augmented reality (AR) is a term for a live direct or indirect view of a physical real-world environment whose elements are merged with (or augmented by) virtual computer-generated imagery - creating a mixed reality.
The augmentation is conventionally in real-time and in semantic context with environmental elements, like for example sports scores on TV during a match.