Rewrite rule:

Options +FollowSymlinks

RewriteEngine on

RewriteRule ^(.*)$ sopa.php [NC]

The top of sopa.php:

<?php

   header("HTTP/1.0 503 Service Not Available");

?>

...followed by a body element that explains why the site is down and provides some links to sites with more info. ( One of which is BoingBoing, which has gone dark. )

I have some JavaScript in a Blogger site and an older web site that redirects to the site with the above mechanism in place.

http://www.mailsend-online.com