“AUGMENTED CITIES” THE NEXT BIG THING:

“In the near future, as you stroll down the street, billboards and street signs will change to suit your interests. Ghostly arrows will float in the air, pointing you toward your destination. Buildings, vehicles, the apparel of those you pass, and the very fabric of the reality you perceive will all be as changeable as your wardrobe.  That’s the vision of futurists and science fiction authors like Vernor Vinge, and increasingly, it’s the reality brought to us by ever-more-powerful mobile devices. Some day soon, when our cell phones are connected to display systems compact enough to project images on the inside of eyeglasses, the boundaries between the digital and the real world will simply dissolve.”

Be sure to check out the video in the article too.  Interesting stuff.