This post from Technology Review is about mobile augmented reality, one of the 10 most promising technologies according to MIT. I agree. This advanced technology will probably be used due to its inherent great usability and intuitiveness. This sheds new light on current developments like QR codes, semacodes, barcodes and RFID readers in mobile devices, although they can co-exist in my view. The available codes/tags still have value, albeit in more particular settings with very particular objects (supermarktes, museums, billboards and other traditional marketing media etc.).
"Last October, a team led by Markus Kähäri unveiled a prototype of the system at the International Symposium on Mixed and Augmented Reality. The team added a GPS sensor, a compass, and accelerometers to a Nokia smart phone. Using data from these sensors, the phone can calculate the location of just about any object its camera is aimed at. Each time the phone changes location, it retrieves the names and geographical coördinates of nearby landmarks from an external database. The user can then download additional information about a chosen location from the Web--say, the names of businesses in the Empire State Building, the cost of visiting the building's observatories, or hours and menus for its five eateries."