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Digg Labs has just launched four of its applications for you to use as a screensaver. They're pretty cool, and can be fun to watch, if watching Digg in action is the thing for you. You can download them here. The four apps available as screen savers are the Arc, which shows a growing circle of Dugg stories, Swarm, which circles stories as they're dugg, BigSpy, which places stories at the top of the screen as they're dugg, and Stack, which shows stacking diggs occurring in real time.