Here is a new iPhone application that list about 650 shops over the world (frenquently updated). Shop owners can add their shop to the app for free throught a form on the website. The App is not free, but it costs just 0.89€. I don’t have a smart phone and can’t test it, but for the geek  and the travelers it could be usefull.

Download the Graffitishop App website here