Graffiti art, wall art, street art
Graffiti Art. From Art Crimes.
Intergraff
The international graffiti archive documents and showcases photos of graffiti from around the world.
Wall art, a collection by Graham Reid.
Graffiti, street art, strange signs and murals collected by travel writer and music critic Graham Reid.
Berlin Wall. Art on the Berlin Wall
This collection of photographs documents the Berlin Wall and its art six months before its fall.
Saatchi Gallery street art, a collection of photos and videos.
Streetart
A collaborative weblog for photos of DIY posters, guerrilla stickers and home-made stencils.
Street art
Wikipedia entry.