William Gibson has always been pretty good at predicting future possiblities.
I remember reading one of his books about 15 years ago, Virtual Light, in which he wrote about a pair of sunglasses that, when you looked through them, made objects - such as buildings - contain viewable tags with information such as location, which companies were in those buildings, and so on. It seemed like such a classic, outlandish sci-fi idea at the time, but 15 years later we have augmented reality.
Greg Dawe
Author of Theta Head
http://fictiononedge.wordpress.com/