Google adsense lately has been offering Adwords publishers some nice tools like CPM targeting. What is CPM targeting? Its when a Adwords advertiser specifically targets your website. This is great news for people who make quality content websites. I have noticed a huge increase in CPM since this was implemented. This is really bad news for all these “made for adsense” spam blogs and other sites.
With Yahoo YPN on the other hand I have noticed a HUGE decrease since I started with them a few months back. I suspect this is becuase they have opened up the gates to all the spammers who were banned on Adsense and have been waiting to get there scrap sites back up.