Figured it would be nice to have them all in one place... always will let newbies know what each kind is. CPC: Cost per click - the cost or cost-equivalent paid per click-through. Google Adsense Yahoo Publisher Network (Beta) Chitika BidClix BannerBoxes Adbrite AdSonar Clicksor Searchfeed Revenue Pilot Kontera Adengage.com CPM: Cost per thousand impressions Tribal Fusion Casale Media BurstMedia RealTechNetwork ValueClick Media/FastClick Buds Ad Network MaxOnline 24/7 Real Media Bannerconnect Mamma Media Solutions Adtegrity Ad pepper Media Rightmedia.com Advertising.com Accelerator Media AdSmart AdAgency1 Interclick Realcastmedia.com/ CPA/CPL Cost per Action - model in which payment is based solely on qualifying actions such as sales or registrations. Linkshare Commission Junction ShareASale WebSponsors Advertising.com Azoogle Ads Maxbounty Affiliateer