shez - 6:42 pm on Sep 2, 2008 (gmt 0)
From the last week of Aug, 2008 I've seen a significant decrease in EPC while the impressions and CTR are same. Also i've noticed the Ads now being servred from yahoo's new servers east and west. it is also observed that ads served from these new servers are paying way less. May be yahoo is testing something. please share if you are also seeing some epc drops etc.