Thanks to the success of street artists like Banksy and Blek Le Rat there is no considerable interest in finding and appreciating some of the hidden works of art placed on the hidden walls of buildings and alleyways. Streetartlocator is a new Google Maps mash-up aimed at documenting the locations of the most stimulating and interesting pieces, from graffiti and stencils to gallery exhibitions and outdoor paintings, you'll find them tagged onto Google maps the world over. You can help by adding your own entries or even just by posting comments on those already in place.