Stopping the spread of CP through any means

How would I go about writing a virus that takes down CP websites? I know C and perl, but I've never written a virus or done any Greyhat things before. I'm not asking for a tutorial, but just a few pointers in the right direction to start learning.

Thanks in advanced for the advice.

As mentioned, the best way to do this is through social engineering. You will have to infiltrate some paedo circles, but you can be sure the authorities will do a better job than you can.