Someone forgot to renew their domain registration. Could happen to anyone though, I was just 5 days from losing mine last time. I only remembered after poking around the host provider's control panel and noticing the expiry date by chance.
It's working now. Despite being the registrant I never received notification. Should have known better. My webhost somehow received notification and renewed it. It should be all set now. Sorry for the inconvenience. I'll be sure to mark my calendar!
Scott - Scan New England Webmaster http://www.scan-ne.net
Radio Reference MA, RI, & CT Database Admin