419 Eater : we've replaced your regular scam with this rich Schadenfreude
You're familiar with a 419 type of scam by style if not by name; a nice Nigerian individual wants to move funds using your account, you get a large commission for assisting in the transfer. "419" takes it's name from the section of the Nigerian penal code which addresses fraud schemes.
419 Eater is basically a whole site dedicated to going after and hindering everybody's favorite spamers.
The trophy room is pretty great. As is the scambait and scam baiting tips. Most amusing, perhaps, is the audio page, but by far the satisfying one is the letters page, where the details of the scammers being scammed by the 419 personnel are to be read.