HostGator was down today for approximately 20 minutes. HostGator hosts about 4,000,000 domains, and everyone was tweeting about this:
http://twitter.com/hostgator said that – We are experiencing packet loss at the moment. We are aware of this and working to get this resolved right away.
Now it is resolved and all our sites hosted on HostGator are up.
P.S. 6:00 p.m. is European time GMT+1