I received my email subscription to Inside AdSense just about 20 minutes ago. There’s good news – AdSense is launching a referral program where you can refer products from advertisers now, not only Google products. When a visitor clicks on your referral link, if he/she completes an action defined by the advertiser, you get paid!
This program however is in Beta and not everyone can use it for now. You can try applying here: http://www.google.com/ads/adsense/referrals/
(No no this is not a referral link. I am merely spreading the good news here).