There are evidently some issues with your server at the moment.
The issue has been relayed to admins. We'll try to keep you updated.
It appears as though the issue has been partially fixed. Sites are now redirecting to the defaultwebpage cgi. I suggest you flush your DNS and clear your browser cache at regular intervals, as your site should be back shortly. That way you stand the best chance of getting it back as quickly as possible.
For more information, please see:
http://x10hosting.com/wiki/Defaultwebpage.cgi