I wanted to post and let you all know what the issue was and apologize for the inconvenience. Late last night I asked the server admins to perform some routing maintenance on the database. This was done very late at night when traffic to the site is at it's lowest. Although we experienced a couple glitches during the maintenance all seemed well when we checked the sites after it was done. Apparently at some point in the night a database table crashed and that caused the site not to load. We are looking into the reason this happened and hopefully will not have any more down time in the foreseeable future.
Once again my apologies for the down time and if you experience any errors or issues please report them here and we will address them ASAP.