Google AdSense affiliates can now earn commission on referrals of new AdWords accounts. When a user signs up for Google AdWords through your referral and spends their first $100.00 in advertising, they’ll credit your account with $20.00.
The banners for these referrals (there are no text links!) are similar to those made available for referring new AdSense affiliates to Google.
If you are currently running AdSense on your site with the option for advertisers to advertise on your site, be sure to also include an AdWords referral button to monetize those ad buyers both when they become AdWords users and when they advertise on your site.