In you login to your Google AdSense account and go to AdSense Setup for Referrals, you will notice two more products available – Google Pack and Picasa. That’s right, you will now be able ot earn money by refering users to Google Pack and Picasa, on top of existing referral for Google AdSense and Google AdWords, plus third-party software Firefox.

For each referral to Google Pack, webmaster can earn up to USD $2 per user install. While Picasa referral can earn up to USD $1 per install. Picasa referrals will be available in several languages, while referral program for Google Pack is only available in US English. It seems like AdSense referral program for Google Pack is also only available to US or certain countries’ webmasters.

Google Pack is a free collection of most important software utilities for a PC, which include 3D Earth browser Google Earth, photo organizer Picasa, browser Mozilla Firefox with Google Toolbar, anti virus software Norton Antivirus, Adobe Reader, spyware removal utilty Ad-Adware, screensaver and etc. Picasa meanwhile is a feature packed, advanced yet easy to use photo management and photo editing software.

In addition, for publishers that use Adsense referrals program in US English can now opt for displaying their referral link in text link style instead of usual button or banner.