Digg's Labs section launched last year with new ways to visualize Digg activity. Last week BigSpy, a new visualization tool that's eye candy in the purest sense of the word, quietly popped up. New stories appear at the top of the page, which offsets the rest of the stories in a wavelike motion. The more popular a story, the larger it is and the bigger the "wave" it causes on other stories. It's a mesmerizing effect.