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Spotted all around Austin during this week's South by Southwest conference: a moving billboard (truck, actually) for BarCamp Austin, the "unconference" originally created as an alternative to Tim O'Reilly's exclusive Foo Camp. The billboard's owner, Anderson Mobile Advertising, says their trucks "provide businesses with a creative solution helping them break through today's media clutter." They bought the entire truck, so the same ad keeps rotating, promising "tech, beer, and the karaoke apocalypse."