Visual tags are something already common in Japan. It isn't here, as this link to an Intel Research Paper shows:
New Uses for Camera Phones

There are many scenarios where the combination of visual tags and camera phones can be employed. Maybe you're walking down a city street and see a poster for a movie or a play. On the poster is a visual tag. By using a camera phone, you could click on the visual tag to get more information on the film. Additionally, there may be an option to buy your tickets right then and there.

[...]

Visual tags encode information in two parts: a service identifier and a data block. The service identifier encodes the name of the Bluetooth service to which a tag relates. The data block contains a few bits of application-specific information that are used to identify a particular tag.

PS: SpotCode reader is available for download at the High Energy Magic Web site

See also:
Linking the Web to Real Space via your Camera Phone

Camera Phones:

Mobile phones with inbuilt cameras are officially banned in the Kingdom and continue to sell like hot cakes.

Are there other countries which have banned camera phones? And how will the situation evolve when more and more citizens of Saudi Arabia buy a camera phone on the black market?

Via Reiter's Camera Phone Report