If you currently use Google Adsense referals on your site, you should know that the code will no longer display ads beginning the last week of August. Unless you change or remove the referal code, a blank space will appear in their place.
Google is therefore encouraging publishers to replace all referral ad code on your sites with AdSense for content ad code prior to the last week of August – which you can get by choosing AdSense for content as the product (under the AdSense Setup tab in your Adsense account).
The other suggested alternative is to join the Google Affiliate Network (which is currently transitioning from the DoubleClick Performics Affiliate Network) and is specifically for advertisers specifically targeting users located in the United States.
So, don't waste your ad space. Get those referal ads gone and replaced with money makers today!