[John Scott]

http://adsense.blogspot.com/2006/03/...n-pay-off.html

Fact: Both text and image ads can be paid on either a CPC or CPM basis.

Also:

Myth: If I set my ad unit to 'image only', I'll get exclusively CPM ads.

Fact: As mentioned above, image ads can be either CPC or CPM ads, so you could also see CPC image ads.

Also:

Myth: Joining V7N Forums will not impact your AdSense earnings.

Fact: V7N Forum members earn considerably more than average AdSense Publishers.