Before this, we have Adsense’s Referral Program. Now, as an adsense publisher we have even more:
1. Firefox referrals are now available internationally!
You can earn up to USD1.00 when someone download and install google toolbar from your Firefox referral link.
2. Onsite Advertiser Sign-Up
It works like adbrite.com or adengage.com where advertiser can buy a ad space directly from you webpage using thier own Adwords account. To customize your own Onsite Advertiser Sign-up: