Did you receive a revenue boost through referrals? The referrals team is looking for publishers to participate in a case study, and we want to hear from you. Have you increased your AdSense earnings this way? It doesn’t matter which products you’re promoting on your site, or how long you’ve been a publisher. Feel free to send us an email and tell us about your success.

This is posted in adsense blog. So i think we need to tell google that the referels sucks!!

For me they are just wasting the adspace.

 http://adsense.blogspot.com/2006/11/you-refer-we-listen.html