Great article, and I'm pretty sure this is what one or more well financed parties have been doing since at least January. People tend not to remember the lag spikes that "crash" the market from $40ish to $30ish and back, despite being a major correction
An exchange with 80% of the volume, that can only handle a pathetic 35 trades per second before lagging out means you can just "DDOS" it from the comfort of your desktop, without having to go to all the trouble of paying for a botnet or performing a real DDOS attack.
With $60,000 worth of servers you can easily build a backend that can handle 1000+ trades per second. MtGox makes that much money every day. My pa always taught me to "never assume conspiracy where incompetence would give the same result"