To remove a site from the internet [competitor, bad guy, good guy, enemy, let your imagination run wild]... What is keeping someone from spamming half a dozen or so sites (just enough to get noticed) with the line "please visit site 'http://www.xyz.com' for more information."
The same laws that apply to someone running a false advertisement on TV or newspaper should apply here. Any ISP would be willing to help law enforcement with appropriate warrants to track the identity of the spammer. Take that one step further: we need legislations to make spamming illegal, just like making crank telephone calls is. I've a feeling even the smallest ISP would rather cooperate with law enforcement to help track the identity of the "law-breaking" spammer than the messed up system today where the selp appointed anti-spammers feel good about heaping guilt on ISP's rather than actually punishing the spammer. It is upto us whether we want to extend the civilized system (that gives the state monopoly over judicial matters) that protects our physical property to our cyberspace property or continue to fantasize that every ISP must implement "my version of the AUP". Sanjay.