Next time someone finds a link to this shit they should do what others mentioned in this thread and contact
http://www.asacp.org. Another option is too contact the people at
http://www.torontopolice.on.ca/sexcrimes/ces.php ; they will go after these people with a vengence and have the international contacts that would allow them to track the people responsible for this down.
Well contacting the register and host is well meaning, by playing internet gumshoe you have shut down the site and alerted the people behind this now and they will just slink away only to pop up again with something else. If you were to contact one of the links mentioned above an investigation would have been initiated and the authorities might have been able to track them through monitoring of the site/s.
If you remember there was a case a few years ago of a couple in Texas I believe that were running child porn sites. The police were on to them for years but let the sites continue to operate for sometime as it allowed them too track the owners and the users of these sites. This allowed authorties around the globe too arrest thousands of the sick fucks who make, distribute and purchase this stuff.
Well I commend everyone's good intentions, next time you should leave the investigating to the pro's; it's their job and their good at it.