Quality Webmaster Blog

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

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WidgetBucks is shortening the list of countries that pay on a CPM (cost-per-thousand impressions)

List of countries whose traffic continues to pay on a CPM

Australia (AU)
     Austria (AT)
     Belgium (BE)
     Denmark (DK)
     France (FR)
     Germany (DE)
     India (IN)
     Ireland (IE)
     Italy (IT)
     Netherlands (NL)
     New Zealand (NZ)
     Portugal (PT)
     Puerto Rico (PR)
     Singapore (SG)
     South Africa (ZA)
     Spain (ES)
     Switzerland (CH)
     United Arab Emirates (AE)
     United Kingdom (GB)

 only traffic from the list of countries above will earn CPM revenue. Site visitors originating from countries not on the list will result in zero payout