Now everyone can use Google Sites on their own domains, using their own URLs. In July we added this popular request for custom domains for sites created in Google Apps, and today we extended the ability to change site URLs for for all users of Google Sites.
To ensure that only proper domain owners can make this change, you must be the owner or administrator of the domain and have access to change the domain CNAME records. More details on how to set this up are in our help center.
Posted by Di Wang, software engineer