Google Contributor - A New Revenue Source For Your Sites
Google just released Contributor. Is a new source of revenue for your sites, funded directly by your site visitors. With Contributor, anyone can pay a monthly subscription to see fewer ads across the web. Each time an ad is removed on your site, a thank you message appears in its place and Contributor helps to fund your content.
Currently, to sign up for Contributor, users must have a U.S. billing address. For more detail, go to this page