As of today, to get your domain setup with AdSense for domains, you can simply delegate your domains’ nameserver to Google’s DNS nameserver. This is typically a single step with your registrar, and simpler than the old method of changing A records and creating CNAME records. You can still use the old method if you prefer, and domains that are already set up will continue to work.
To get started, review our instructions for delegating your nameserver to use Google’s DNS nameserver in our Help Center.
If you own any domains that you haven't yet had a chance to develop, now is a great time to sign up for AdSense for domains.
Posted by Randy Heath - AdSense for domains team