Sure, most Americans spent last weekend grilling meat, drinking beer and blowing thing up. But the pasty, lonely few that spent Forth of July weekend browsing the websites of the Department of Homeland Security and the Department of Transportation noticed something terribly amiss. Those websites, along with 12 other US government websites along with numerous South Korean government sites were loading very, very slowly, and sometimes, not at all. The culprit? A massive distributed denial-of-service attack.