Google allows you to have up to three ad units and one link unit on your pages. If you have long pages with lots of text, can only use small ad units or are in a niche with a large ad inventory, multiple units can pay off. Keep in mind that the way ad serving works is that the higher value ads are delivered to the first ad unit block encountered in your code. Always make sure that this first ad unit is displayed in the best location (yeah - test). You want the higher paying ads to be in the prime hot location on your page. Weaker locations can get the lower priced ads. And if none are available, then nothing will display unless you've included an alternate ad URL in your Google code. To maximize monetization you should be including alternate ad URLs, especially if you are putting multiple units on a page. The use of an alternate ad URL also eliminates the possibility of being served PSAs (Public Service Announcements). It's your real estate, maximize your returns.

Nothing here is secret. Except for using the alternate ad URL, all of this information is available from Google's Optimization Tips page - http://www.google.com/support/adsense/bin/static.py?page=tips.html . You can buy books and courses, visit a dozen forums and, in the end it comes down to what your visitors do on your site. The best you can get is general guidance. This means averaged outcomes over many sites, many types of content. If you are serious about doing whatever you can to really optimize your AdSense returns, there is only one thing to do - test. Whether it's AdSense, opt-ins, copy, headlines - anything with a measurable outcome that you can track - then the way to improve is to test and keep on testing.

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