Spider-Man 3 Tagged
Billboard for Spider-Man 3 tagged by a guy who I believe goes by the name "Augor". Actually, I think the kids call it "modifying," while a tag is just a name or alias scrawled anywhere and everywhere.
While all tags are lame, there is some really amazing graffiti out there and this guy's modifications are pretty cool. You can search Flickr for more of his work. I especially enjoy the Silver Surfer one, which I saw, but didn't manage to shoot.