A Distributed Denial-of-Service (DDoS) attack is something that can have a ripple effect throughout the Internet, and typically not a good one. On Christmas Day, we saw both the PlayStation Network and Xbox Live go down — and with regard to the PSN, down hard. That was all a ‘marketing scheme’ according to the group claiming responsibility for it. "Just how is a DDoS a marketing ploy?", you might ask. As it turns out, the hacker crew behind the attacks are now selling their DDoS services.