Advertisers also have additional opportunities to find their customers, and ads on these pages convert well. In addition, we regularly receive requests from advertisers who have found domains to be an effective way to reach their users.
The product will be initially rolled out in phases to English-language AdSense publishers located in North America, and we’ll expand to additional regions and languages in the future. To check whether AdSense for domains has been enabled for your account, log in and visit your AdSense Setup tab. For more information, please visit our Help Center.
[Via Google Adsense Blog]