The Situationist App. For the revolution of everyday life, or not?
Culture Jam: Hijacking Corporate Culture [39m CBC Short Cuts version on Google Video] is an overview of "culture jamming". [more inside]
20th Century Avant-Garde is a great resource guide to experimental art from 1900 onwards. Special sections for dada, the situationists and fluxus. You can also browse by categories such as artists, film and video art, movements in art, publishers and many more. If you're interested in experimental art of the 20th Century you can get lost in this site for hours.