I've been documenting graffiti in MA for a little while now. Feel free to follow me on Flickr or Tumblr if you got one!
http://www.flickr.com/photos/jfph0tos/
http://jerfolcik.tumblr.com/
Also post some photos over here on my buddies flickr too.
http://www.flickr.com/photos/wgjfph0tos/