Another ad revenue sharing site I joined. I never get paid yet but I am promoting it because some of my friends already get paid with it. The idea is, they give you as ad to be placed in your site, and they will pay you for every impression. It is free to join and open worldwide. But the ads are not available for every member. You just have to wait until an advertiser choose your blog.
Here is my referral link:
http://www.crispads.com/crispads_referral.php?rfid=8552