The Voice of the Street
The Voice of the Street have produced this cutting edge website that allows street artists to receive feedback from members of the public.
Artists leave a QR code on their work, members of the public then take a picture of the QR code with their mobile phone and leave a voice message for the artist. I think there could be a huge call for this. I mean who hasn't seen some graffiti and wanted to leave a message for the 'artist'? I just wonder whether most of the comments are going to be what the artists want to hear.
Here's a video explaining how the service works:
The Voice of the Street from Leif on Vimeo.