I know this is the wrong response, and I would never do it. BUT
DOS the living crap out of the ip's where these things originate from. Coordinated counter attack, multiple companies that have seen their bandwidth/business affected should all be part of this counter attack.
Pound the crap out of these jack offs, and do it for a day. While their servers are fighting off the attacks, go in with guns blazing and plant a virus that wipes their hard drives clean.
Ok, I feel better now. They have given me my medication and please realize that the previous two statements were made while under duress of not having my said medication.
No, I don't think we should do what I just said. But, man.... Just the thought of it makes me feel good some days.
Dan