the biggest ad placement mistake i see on the blogosphere is the sheer lack of utilization of the prime spaces on many sites. many bloggers fed up with the feeling that the ads arent working settle for a few adsense for content ads and collect on the pennies. the most effective way of sustaining a tremendous blog income is by utilizing adsense for referral ads in your prime spots which are up top and either side of your posts in the scroller pad. ads up top are sure annoying but they will make you money and often times an adsense referral ad that gives you a hundred dollars every few months is much bettar than an adsense for content which ranges in the few cents to a few bucks depending...i also highly recommend an adsense for search up top to utilize the bounce or people curious to go elsewhere. oftentimes in the hunt of other info the ads often seem more relevant than the mill net spam that generally pops out on many search queries because of the immensity of the mere mentioning of any subject.

I really like referral image only like a button near where your blog archive is because many people hate going through the archive and will hit this.

also try an adsense for referral up top so the words are seamless with your site with the feeling that there are no ads