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When the prospective advertiser clicked on the link, he'd be taken to a Google AdWords form that would allow him to:
1) Buy an AdWord only for my site;
2) Buy an Adword for my site plus Google Search;
3) Buy an Adword for my site, Google Search, and the entire AdSense network.
This would be great for me, because I have no desire to get into advertising sales but would like a way to sell ads.
It would also be good for Google, because it would provide Google with referrals and it would promote sales of AdWords on content sites.
As an aside, could someone with both an adwords account and a site with AdSense ads please try this out :
Find a sentence that is only on your page, and place an adwords ad for that keyword as a phrase, and bid high to make sure it shows. Does it show? If so, then it's an easy way to tell people how to advertise on your site.