Earlier this afternoon (Monday Sept 10, 2012) GoDaddy acknowledged via their Godaddy Twitter site that they are experiencing a major outage. GoDaddy-registered web sites are offline. At around 4pm (EST) they tweeted the following:
GoDaddy Update: Still working on it, but we’re making progress. Some service has already been restored. Stick with us.
As far as I can tell, this outage does not affect any sites that are just using GoDaddy’s SSL certificates.