On the topic of European innovation, this demo application from the Nokia Forum rocks. Basically, it uses the Sensor API in the latest version of Symbian S60 and the phone camera to detect what you’re pointing the cam at, and show information related to it.
Naturally this information could be sucked in from the Web, which opens up the healthy possibility of not just user-generated, but unofficial user-generated markup for the cityscape with constant feedback. A simple implementation might do something like hashing the geographical position of the feature with its direction and appending that to a selected URL.
The real purpose of this is surely the old Surrealist aim, to bring the logic of the visible to the service of the invisible; to put in the horrible details of how that particular bank wants to pass the SKU of the item you just bought back to headquarters with the credit card authorisation request, all for your own good, or how the owners of such-and-such a monster warehouse ordered the staff to moon for the camera because the newspapers wrote bad things about them. (I agree, these examples are prosaic, but then, that’s me.)