Art Crimes: The Writing on the Wall: Graffiti art and graffiti style writing from around the world.
Graffiti - A Hidden Expression of Culture: Brief discussion of public graffiti and latrinalia.
Institut für Graffitiforschung - Institute for Graffiti Research: Everything you want to know about European graffiti (in German and English).
International Workgroup on Graffiti Research: Articles and links to all aspects of graffiti (in German and English).
Kilroy Was Here: On the origin of the phrase and the accompanying image of Kilroy.
Nuggets of Bathroom Wisdom: The stirring truths of life, as written by drunk, peeing people.
Pictures of Walls: Gallery of pictures of walls with things written on them.
Stranger Than Fiction: I Am Omnicide: Shadows on a Bathroom Wall: Stefene Russell's essay on bathroom graffiti.