"Our experimental wearable augmented reality system enables users to experience hypermedia presentations that are integrated with the actual outdoor locations to which they are are relevant. The mobile prototype uses a tracked see–through head–worn display to overlay 3D graphics, imagery, and sound on top of the real world, and presents additional, coordinated material on a hand–held pen computer. We have used these facilities to create several situated documentaries that tell the stories of events that took place on our campus."
(Tobias Höllerer, Steven Feiner, and John Pavlik)
http://graphics.cs.columbia.edu/projects/mars/movies/SitDocs2.mpg