I just read about this great opportunity from Google. Now you can actually earn money by referring people to download Firefox and the Google toolbar (a great combination) for free.
When a user you’ve referred to Firefox plus Google Toolbar runs Firefox for the first time, you’ll receive up to $1 in your account, depending on the user’s location. For more information regarding this great opportunity, read about the Google referral program.
Click the button on the sidebar (on the right) for more information.