The initiative is an extension of Google's site-targeted advertising program AdSense, which launched this year. The link takes potential advertisers to a page where they can create an ad that's target to the publisher's site.
Ads created through Onsite Advertiser Sign-Up would compete in the same auction as all other Google ads, including keyword cost-per-click text and image ads, and site-targeted cost-per-thousand impression. Ad publishers would be entitled to a portion of the revenue.
Ad publishers can customize the destination page for links with their own logo, color scheme and site description.