I just ran across BRANDCASTER while looking for new affiliate programs and it looks like it would be a great complement to AdSense: https://brandcaster.coupons.com You get paid for each coupon that that is printed from your site (without the visitor leaving the site). Supposedly the coupons are contextual (the code was developed by a former AdSense engineer). Does this violate Google's TOS? Has anyone tried it....maybe you can turn off the contextual part and serve coupons via keywords?