Of all the biggest blunders you do not want to do, GoDaddy.com has let their security certificate expire and is now taken offline.  As of 4:10 PST, Dec 19, 2007 Godaddy.com has ceased to exist.  This is a major blooper for a company that prides itself in reselling SSL Certificates, and in providing web based tools to manage your domain names, websites, and auctions for domain names.  All three which can expire in the time godaddy is down, presenting a huge problem for anyone who has a domain name expiring tonight, or who needs to manage something for a client using the tools at godaddy.

Here is a screenshot of what happens when you try to go to godaddy.com, after seeing the standard  "The security certificate for this website has expired"  message and agreeing to go on to the website anyways...