Google today announced that AdSense users will have to submit each website to a verification process which checks that the Adsense user owns the domain or have the ability to modify its content.
Only after the domain is verified, ads can be shown on the new website. The process also reviews your site for compliance with the AdSense Program policies. After the checks are completed, the site will be marked as “Ready” and ads can be shown.
Existing sites already being monetized should automatically appear in the sites list, accessed by clicking the new Sites tab.
Google is also renaming the My Sites tab to Sites and moving it further up the menu to make it easier to find.