Looks like he is just in the process of moving servers as I'm getting a message at work saying it can't determine the ip address as I haven't accessed that site from work before it will not be cached hence the different message I get.
It can take 48-72 hours to come back up again.
He could have been getting too many hits and thereby exceeding his webhost traffic limits so has been forced to find a new host. Should know in a day or 2 what the score is.