Internet spam is on the rise, and more importantly spammers are targeting your sites comment forms. They are looking for the trackback urls to fool search engines into ranking their website higher in the search results. When this started to happen to me, I wanted to sent out emails to the offenders demanding that they stop. Unfortunatly the spam is being generated by bots and programs not some pimple faced kid behind a keyboard. Banning IP addresses is not enough and rarely works since intelligent spammers hide their true identity anyway. Next approach... Banning Keywords used by the offending sites. Thats where this tutorial comes in.