Jonathan Berger, Google Checkout Product Manager has announced that from now onwards some of the AdSense ads will display Google Checkout shopping cart badge alongside the ad title. This step has been initiated to help the users identify the sites where the users can use Google Checkout while making a purchase. This will allow them to with easy and safe checkout option at the time of a purchase.
Jonathan further comments:
In addition to shopping carts on AdSense, we're also introducing new badges on ads that appear in Google search results. We hope you enjoy these new additions to our ad formats. It's another step in our ongoing efforts to enhance the experiences of AdSense publishers, AdWords advertisers, and visitors to your site.