If you're in Los Angeles or near by, don't miss MOCA's Art in the Streets exhibition. It ends August 8th. It's one of the best exhibits I've ever seen.
From the website:
Art in the Streets is the first major U.S. museum survey of graffiti and street art. Curated by MOCA Director Jeffrey Deitch and Associate Curators Roger Gastman and Aaron Rose, the exhibition will trace the development of graffiti and street art from the 1970s to the global movement it has become today, concentrating on key cities such as New York, Los Angeles, San Francisco, London, and Sao Paulo, where a unique visual language or attitude has evolved. The exhibition will feature paintings, mixed media sculptures, and interactive installations by 50 of the most dynamic artists and will emphasize Los Angeles's role in the evolution of graffiti and street art, with special sections dedicated to seminal local movements such as cholo graffiti and Dogtown skateboard culture. A comprehensive timeline illustrated with artwork, photos, video, and ephemera will provide a historical context for the work.