Has anyone here ever used Google's AdSense CPM (vs. CPC)? Is it effective?

I think the CPM is more a way to compare different ads and how they're performing. I don't believe I signed up for anything specifically, but I do earn some money occasionally from people viewing an add. Not much, I know it's from just the view.

I think it's the image ads that occasionaly show up, but I'm not really sure.

I use CPM more than CPC. That's b'cuz I get a lot of traffic(About 10000 per 3 days). But, all those people ignore the ADs. You can know that frm my CTR. Its 0.40% !!! But, I dont get anymore than some 50 cents for it. CPC is better than CPM alright. But, I dont get that much CPC.