I am just reading up on all this. I have just emailed every one of the advertisers listed on that page to make a complaint. I suggest the entire population of internet users do similar.
I am about to go and read the threads on this over at gethighforums and geekvillage. I really believe that everything possible needs to be done by users to create a user movement against this.
2) Put something into your terms of service that prohibits the user from adding/removing/changing links using link viruses. Don't know what good this would do, but it would not hurt to sure up your terms of service (after all, a sensible interpretetation of copyright law would already prohibit link virus IMHO).
3) PROTEST!!! Email everyone, including the Pope and tell them you are mad and you are not going to take it any more!