Sites which offer other peoples' perspectives of the advertising networks such as those reviewed here on AdBalance.
These sites offer other web publishers' reviews and criticisms of internet advertising networks. However, if you found the reviews on this site useful, then please use the sign up links here on AdBalance to sign up for each network.
This is one of the original ad network review sites run by the owner of Geek Village, and someone with some great knowledge of the industry which he passes on through articles and reviews.
This offers some in depth reviews of the ad networks separated into categories, and also has a useful tool for calculating your estimated monthly revenue.