In addition to AdSense, AdWords, and Firefox with Google Toolbar, Adsense added two more referral products--Google Pack and Picasa-- to boost its publishers' revunues, with saying You'll earn up to $2 for each time a user installs Pack and up to $1 for each Picasa install. May because Pack referrals are currently only offered in US English, not all pulbishers including myself (see the picture) are eligible for distribute this referral.
To help the button feel more at home on your site, Adsense introduced new and improved referral buttons which are designed more sleeker, more web-friendly GIF image and added several additional colors to choose from.
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