Its probably something you have all heard before, but its about how you place adsense ads to give you the most revenue without making the site look horrible and spammy. I WAS using the the old tried and tested ad layouts: You have probably seen this picture before a million times, and I thought it was the best way to lay out my ads. But I was only achieving 6-11% CTR, which is not bad. This is how I laid out my ads (in blue): But I decided to do some A/B split testing on different ad layouts. So I chnaged my website to look like this: And look how my CTR changed from lower numbers above the orange line, and below. I believe this is down to how 'new' style websites have changed how we look at them. Often these days you have a large header banner which is designed to give short information or deals, so people now look at this first and click on something they like. Whereas the old style websites which those heatmaps are based on, do not have this large header and are very content orientated. So now I have converted all my websites to a modern design, and switched the header banner with adsense. This means my earnings have just tripled overnight.