We experienced an interruption at the server level yesterday. The core problem has been corrected, however it may take some time to filter through all DNS servers. Some of us were able to get back on yesterday, but others are still experiencing problems today. If you are able to get to the site, but know someone who can't, please pass the word that we're here and to just be patient until all the DNS servers catchup.
We apologize for the inconvenience and appreciate everyone's patience.