J Magic makes a fantastic application, that lets sample new music on your mobile phone just by pointing it at a poster.
Lets say Chas and Dave have a new album out. You're walking down the street, see the poster and thinking, gertcha, I've got to have some of that.
So you point your phone at the poster, it reads a code, then goes on the mobile network, finds the right server and downloads the sample of "Rabbit Remix".
It only works in Japan. Why? Because our operators are too timid to try anything this exciting, say some.