Remove all your Adsense referral code from your sites/blogs

According to Google, they are “constantly looking for ways to improve AdSense by developing and supporting features which drive the best monetization results for our publishers.” To that end Google offers several options for current AdSense Referral publishers:

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"We're constantly looking for ways to improve AdSense by developing and supporting features which drive the best monetization results for our publishers. Sometimes, this requires retiring existing features so we can focus our efforts on the ones that will be most effective in the long term. For this reason, we will be retiring the AdSense Referrals program during the last week of August. We appreciate your patience during this transition and here are some alternative options to consider:"

Visit http://adsense.blogspot.com to read more.