Vernor Vinge, call your office. Researchers at the University of Tokyo are developing "Smart Goggles" that have the potential to map your real environment:
The camera records everything you focus on. So you begin training the Smart Goggles by slowly walking around your environment so they can learn your space. While doing this you can focus specifically on items, like your keys and cell phone, that you may need regularly, and you name them as the Smart Goggle camera is recording them visually. By training its computer to get to know your space -- your office, your house, your car, maybe even your purse -- it will be able to find items in your environs when you need them.
From there, your environment could be linked to the internet, or any database you like. It looks like this is a first step toward the kind of real-time, visual overlays which augment the real environment that Vernor Vinge described in Rainbow's End.
-The Fredösphere