After reading the Official AdSense Blog, here are some good tips…
AdSense’s content-matching technology is designed to provide useful links and resources for your site’s visitors — but they won’t find the links useful if they can’t find them at all!
1. Take a look at each page on your site and imagine yourself as one of your site’s visitors. Would he or she rarely scroll down? If so, be sure to place an ad unit above the fold. If there is plenty of engaging content below the fold, feel free to monetize the space with more ad units.
2. The typical newbie mistake is to place a leaderboard at the very top of the page. In our tests, however, we’ve found that users’ line of vision typically goes straight to the area below the header. You might find that moving the top leaderboard or banner below your site’s header would most likely result in an increase in CTR.
3. On that same note, there is a significant difference in having an ad unit directly after your content versus after the footer, the “contact us” link, or a chunk of white space (remember: white spaces don’t make you money!). One publisher who had a border around his articles saw a 300% increase in CTR when he simply moved his ad unit within the border. Similarly with forums, moving a leaderboard from under the footer to directly after the last post typically results in a 200% increase.
4. And the best tip we have in this category is (you’ve guessed it): an embedded rectangle unit. An ad within an article can serve as a “commercial break” for users who are tired of reading. Not only are CTRs usually in the range of .5%-2%, but they’re also a popular unit for site-targeting campaigns.
