Google announces the retirement of Google Referrals this coming August 2008. Google decided to stop with their Adsense Referrals for AdWords advertiser products and Google products. Instead they will serve their clients with their Google Adsense for content and DoubleClick Performics Affiliate.
If you are still using this feature of Google, you better replaced it with Adsense for content and make use of the Google’s Customized Search so that your Google earnings will not be affected by this change. I have taken this information from Google. I’ve seen this information from the red colored announcement of Google when I checked my Adsense earnings today.