If you are a fan of Google Calendar, Google Docs and Spreadsheets, Google Talk and Page Creator and would definitely love others to enjoy the functionalities of these applications, you might as well earn from referring them. These communication and virtual collaboration tools can help many business, organizations, schools and other institutions since they're not only meant to make communicating online easy, they also offered for FREE and no maintenance is required since they're hosted by Google.
So how do you start earning from Google Aps?
"Just visit the AdSense Setup tab in your AdSense account and click
the link for Referrals. Select the Google Apps option and then choose how you want the referral ad to look on your site. (The Google Apps referral ads are available in English right now, but we'll be adding more languages soon.) Copy the code provided into the design of your web pages, and voila!
You will be credited $5 when someone clicks the referral ad from your site and signs up for Google Apps with a domain that has not already been signed up for the service. That person's domain must then have one or more Google Apps email accounts in use for four consecutive weeks. It's that simple."
via Inside AdSense
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