Here's a site I heard about on Opie & Anthony.
It's a site by people who pose as kids in chat for the sole purpose of exposing these scumbags who prey on kids. They basically collect entire conversations, pics, phone numbers, etc., and then they expose them to wives, girlfriends, bosses, and of course, the authorities.
For those of you who don't realize how many of these pervs are out there, you need to see this (especially those of you with kids). And these are just the ones who get caught!