Google's AdSense blog has announced that Google will pay $2 for referrals that lead to Google Pack downloads, and $1 for Picasa installations. "To display Pack and Picasa referral buttons on your site, all you have to do is select Referrals from the AdSense Setup page of your account, and then select the product of your choice," it says.
Google also pays US publishers $1 the first time a user installs Firefox with its Google Toolbar.
