Hm...the sites have been quite stable today and recently. They were down for a bit a few weeks ago.
One thing that might help you: try closing the browser altogether and reloading it. See if that doesn't help. The general rule is: if you can access DKPSystem.com, but you can't access your site, then your browser freaked out, and should try closing and reopening it.
I have this problem often with users of IE 7.0. Will let you know if I see it happen with Firefox or Safari.
Anthrax