I enjoy Graffiti art. The Syracuse Grafcore artists opened my eyes to a new expression of urban living. I still wish I had taken some pictures of their work on the water towers above campus. Great stuff.
JBA sent this link to Banksy's collection. Banksy is a tagger/bomber/graffiti artist in the UK. His work is right on. Never underestimate the power of public expression. Check out his History of Civilization.