In a surprise deal, job site Dice has acquired Slashdot and two other tech sites from Geeknet for $20 million cash. The move is risky but could pay off if Slashdot’s millions of smart, Star-Wars loving readers stick around. For the unfamiliar, Slashdot is a self-described “news for nerds” aggregation site that is home to a rabid base of commentators who will debate topics like Firefox updates and