I don't understand how people could have withdrawn bitcoins, used transaction malleability to make gox think there was an error and resend the coins... to the tune of 750,000 BTC without mtgox noticing something was wrong...
Screams out "inside job" if that's really what happened. If that's what happened, someone had to have been on the inside cooking the books. (There have to have been books of some sort, right?)