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The AdWords/Adsense referral program is currently operating on a 'by invitation' basis, and isn't widely available as yet.
Still, if you are interested in being considered, please do fill out the application here: [google.com...] Then, if and when the program expands, we'll contact you with your invitation.
Sorry for any confusion. ;)
I think this is something everyone should consider. When somone asks you how you make money online, you tell them "I use AdWords and/or AdSense" and send them to the respective site.