Really, what can the MPAA/RIAA do to torrent sites? There is nothing illegal about them is there? They have no copyrighted data on the sites, only links to it. Here in sweden the biggest torrent tracker has been threatened a bunch of times from different companies, but since the site is not illegal according to Swedish laws, no action has ever been taken.
For a good laugh go to <a href="http://thepiratebay.org"> The Pirate Bay </a> and click on the "Legal threats" link.