Darren mentions that Google have launched the beta of a new addition to Adsense - AdSense referrals (beta)
Unlike "normal" adsense, you don't get paid per impression or per click. You only get paid based on actions defined by the advertiser (where's the adwords end of this to see what the setup is?)
Hopefully this won't become one of those endless betas like the Adsense for RSS / Feeds that seems to have vanished, as it could be a very interesting addition to people's arsenal.
EDIT: There's also a post on the official Adsense blog
Mar 21
Adsense To Offer CPA
by Michele Neylon in Random
2 Responses to “Adsense To Offer CPA”
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From Robert Synnott:
So did you sign up for the beta programme?
From michele:
Robert
I signed up, but I don’t know if I’ll get in and judging by RedFly’s post I doubt if I will:
http://www.irishwebmasterforum.com/google-adsense/1623-google-adsense-referal-beta-program.html