Did you any of you saw http://www.blumenvasen.org/archives/..._pixelpost.php
for anti spam hack or used it before?
Blacklist Plugin for PixelPost
Plocki had a problem with referrer spam. He doesn't any more thanks to a new Pixelpost "plugin" (more like a hack) that I wrote, which is based on the despam tool that Mark McLaughlin wrote for ShortStat. It relies on one of the tables created by Jay Allen's MT-Blacklist (a plugin for MovableType). It's a simple PHP script that is to be run periodically which deletes any referrer that is similar to an item in the blacklist table.
Download the PixelPost Despammer.