Column from last Economist "Cyberwarfare update."

Called a “distributed denial of service” (DDOS) attack, this at its peak involved more than 1m computers, creating traffic equivalent to 5,000 clicks per second on some targets. Some parts were highly co-ordinated—stopping precisely at midnight, for example. Frank Cilluffo, an expert formerly at the White House, says that the attack's signature suggests that more than one group was at work, with small-time hackers following the initial huge sorties.
http://edwardlucas.blogspot.com/2007...re-update.html