Like the experience of running out of gas, which is embarrassing and inconvenient, people who publish their blogs to non BlogSpot URLs may occasionally experience the horror of having their custom domains "run out of gas", or expire. Like having your car run out of gas, it is extremely necessary to confirm when your domain has expired.
The best way that I can confirm an expired domain uses a WhoIs log for the domain.
REGISTRY WHOIS FOR MYDOMAIN.COM Domain Name: mydomain.com Registrar: GODADDY.COM, INC. Whois Server: whois.godaddy.com Referral URL: http://registrar.godaddy.com Status: redemptionPeriod Expiration Date: 2010-06-03 Creation Date: 2009-06-03 Last Update Date: 2010-07-15Today is July 26, 2010. A domain that expired on June 3 is "In Redemption", and may be (depending upon assessed value) purchased by any third party, at any time. My advice today, as any time in this circumstance, was
Your registration expired, over a month ago. Call GoDaddy, today.
And after you get the domain back, you will have to set it up, by hand. So allow yourself a few hours, to read and follow the instructions.