What is the best place to place AdSense Ad?

Just below the title or heading of your page would be the best place to place content base AdSense ads. Placing a blended square shape ad, just after the blog post title increased the click through rate significantly.

If you haven't try it out place a experiment ad just below the heading. However, make sure that the title is not making the visitor click on the ads. For example List of cool download Links may go against the AdSens TOS.