Today I ran across the issue on blogger for setup of domain name with error message of "Another blog is already hosted at this address.". This particular error seems to come from multiple scenarios: Domain being used up by setting up as Google Apps domain and using the sites feature of google apps. Or another administrator or the same person, long ago setup the domain on another login of the blogger/google account.  Domain name mapping changed after blogger publish setup; and it is not mapped correctly to ghs.google.com under the domain registrar after either moving the domain to new registrar or the zone file updated without reestablishing the old zone file settings. For the first issue the tipsblogger have a solution with screenshots: http://www.tipsblogger.com/2009/02/another-blog-is-already-hosted-at-this-address-error-in-blogger-custom-domain-creation/ I will update my blog to add more details or scenarios where this issue might be the reason later on. If you have though