How much was stolen? How many bitcoins are we talking about. It isn't very clear.
I just looked at a few of them and most addresses received from 20 to 100 BTC so it's quite a lot in total, maybe in the ballpark of 1000-2000 coins.
Update: The amount of BTC that was stolen was calculated by Nicholas Weaver @NCWeaver – Computer Security Researcher, to be around: 4474.266369160003BTC that are with the value of about $2.7 Million.