I want to talk about a recent experiment I did for one of my sites in relation to increasing Adsense CTR. Originally this site had two columns, a navigation column on the left, and a main content column. The only advertising on the site was Adsense (two blocks). Then, I started noticing that all the big, established sites have multiple ads on their pages, and I thought, why not do that on my site? So, I added a third column to that particular site, and that column is entirely advertising, consisting of 125×125 boxes and a 120×600 skyscraper. Those are mostly affiliate links.