Google just announced another way to earn income. You can refer customers to the AdWords program and earn twenty dollars if the person you refer spends at least $100 in the first 90 days. This complements the other ways Google has for you to earn money, by referring AdSense and FireFox. Here's the breakdown:

• AdWords Referral: Earn $20 if the person you referred spends at least $100 in the first 90 days.
• AdSense Referral: Earn $100 if the person you referred earns at least $100 in the first 180 days.
• FireFox plus Google Toolbar: Earn $1 for a referral when they run FireFox for the first time. Note that it must be a Windows user who has not previously installed FireFox.