Voice of the Streets is a interesting site that gives graffiti writers and artists a way to receive feedback on their work anonymously. Because it's in Beta form, the functionality of the site isn't really smooth, but the concept is pretty hot. The graff artists could upload their work and receive a unique QR Code (which conveys info like URL, images, phone numbers, etc), all the while uploading their own voice message. If someone recognizes the work, they could leave the artist a voice-mail response to their work.
There aren't many uploads to this website and it seems to be a global project, so there are language barriers involved. Adding a simple text feedback option could be advantageous to the site so artists could translate the response if it was in a different language or if the voice-mail fails somehow.
Engaging the graffiti artists with their public/fanbase through technology is an interesting one as it provides an open, anonymous channel of communication, while increasing visibility for the artist.
