Total Number of Links

Not having an extraordinary number of links on any of your content pages is a way of increasing revenue by decreasing the options presented to your web site visitor. Think of it like this: If one of your web pages has fifteen links and one wide skyscraper on it, the user then has twenty options to leave your page without closing the browser window. Therefore, if the user clicks on a link, then the odds that the user will choose to click on one of the AdSense links are 5 in 20. If you instead reduce the number of all the other links that you have on your page to say 5, then the number of options available to the visitor is reduced to 10, making the odds of the user choosing to click on an AdSense link 5 in 10.

Test, Test and Test Again

Testing, trial and error is going to be essential in increasing your CTR percentages. Try changing your ad colors and then keep an eye on the stats to see if there was any improvement. Do the same thing with the different ad units and different ad placement. If there's no improvement, try something else. You'll get it right.