It's "Hidden Money"

"Seeing is believing", they say. Most webmasters love to obsessively track their visitors, earnings and CTR's several times a day. They love to see what's there, but they often miss what can be.

AdSense doesn't give you ultimate control over which ads are served, how the ads are rotated or what each click is worth . That's a good thin g, because it's hands-free income. (It does give you some control though, and I’ll tell you how to use those controls in this book.)

But many webmasters still think that once you've stuck the AdSense code on
your page, there's little you can do except wait and watch. Nothing could be further from the truth! Google gives you a great deal of control over you r ads, and especially their visual or graphic elements. By tweaking these elemen ts to you r advantage, you could easily — in as little as a few minutes — mu ltiply your click-throu gh s many, many times over!