Or how about this? Imagine a store you'd walk into, get issued a pair of glasses, then you could walk around, look at things, and have information about 'em magically appear? How cool would that be? Answer: awesomely cool... the first time. In year one, that store would be the coolest thing on the planet. But the fiftieth time you go in there.... meh.
They're doing this in Korea already, I believe.