I have released my Link Spammer module for Ravennuke(tm). This module allows the admin to block known profile spam links. If a user tries to add one of these links in their profile website field, they are automaticlly suspended and their username gets the word "banned" added to the end of it. They are then redirected to a page telling them they were banned because they tried to use a website url that is considered spam and advised to contact the admin if this happened in error. As admin, you can add or remove links that spammers use.