Here is the code to tell Google to start emphasizing the content on your page:
<!-- google_ad_section_start -->
Then after your article put the following code:
<!-- google_ad_section_end -->
Using these tags will help you to insure that google puts the adsense content on your page that actually has to do with what your page is about and of course this will help your click thru rates. In many instances it will also result in more expensive key words being displayed and therefore also increase revenue from your adsense campaign.