It's not gone, Duke has a full backup.
Since he was the actual host, it's still live. As he says, add "184.108.40.206 www.mess.org" to your hosts file and you can still access everything.
I would wager that mess.redump.net will be coming back in the interim, but that hasn't been confirmed yet.
redump.net is a decent domain name for anything Dumping Project, in my opinion