Best Google Adsense Placement to get higher CTR?

• Place Ads above the fold, i.e. you dont have to scroll down to see the ads. Moreover it loads before your entire page does.
• Provide lots of free space around ads so that they stand out and users know where to find them
• Experiment by changing the location of advertisements. Track them by channels to see which location works. Sometimes they can do wonders.
• Many experienced Adsense users have reported better CTR with vertical ads rather than the horizontal ones. But that really depends on your site structure.
• Usually it is recommended to place towers on your right, as users tend to use the mouse to scroll the bar on the right side wiht a higher chance to see your ads. Some have reported doubling CTR’s by placing towers to the left rather than the right, as people have got bored of seeing ads on the right, it has something to do with the sidedness of the brain which I do not understand and there is a tendency to read from left to the right.
• Many sites will have small ads in the top right hand corner, as they claim it is the first place where the eye sees.
• An excellent article on Eyetracking - What We Saw When We Looked through Their Eyes helps to tell you where users actually see first and in what order.