I have turned many users in when I have found child porn in their shares. I usually pull up every bit of data I can find on the user, their ISP, and anything else I can find to help authorities. I then submit it all and hope they are dragged off somewhere and punished severely.
I hate anyone who would ever harm a child. And anyone reading this who does participate in such things, I want you to know that this is your future. I will be around WinMX for a LONG time to come, and if I happen across you, you will be going on an extended vacation.
Best Regards, and Be Good
Scyre