I just went to try to look up their domain name - there is a "who is" database that tells you stuff about each domain. When I went there, I looked up the domain name servers which usually reflects the name of the hosting company for the specific site - - but that site is down too. It sounds like a big technical problem - but that's partly conjecture on my part.
I sure hope it can be fixed soon. That's the best chicken resource I've ever seen.