1)You get the CPM $$ when a CPM ad is vieweed 1000 times. Is that right??? And why ain't there any column stating CPM in the earnings report??? 2) What about "eCPM" ? It's something totally differnert casue it just divide total earnings by total impressions as a mean to help you evaluate ur earnings. Is that correct or is it related to CPM??
Correct. Google is not reporting this value separately since: a) they want publishers to concentrate on growing their CTR and thus earnings rather than looking to pick higher paying ads by trying to block CPM ads, etc. b) CPM ads are supposed to be good for publishers as they claim to guarantee the same or higher CPM as the average eCPM reported on your acct. And, what's perhaps even more important for Google, having CPM ads in the network means attracting more AdWords advertisers. You are correct. Here is a more detailed info http://adsense.blogspot.com/2006/02/ecpm-what-exactly-is-that.html
Liminal, thats a good description to link to. I like the hand drawn math example. Makes it as simple as you can get!
just a FYI, the "m" in CPM is the roman symbol for thousand eCPM is the effective Cost-Per-Thousand impressions