Just by putting an adsense window in the sidebar of your website doesn’t mean you’ll get instantly money. Besides the fact you need to place adsense in a well seen hot spot place ( there are lots of tools … search box in right sidebar ) ; you also need to be sure the links in the adsense bar will be interesting for you’re visitors. How to monitor the links … ? well … google’s workers programmed adsense in a way that it would publish not just a random link from the server … but also interfere with you’re website’s content and decide automatically which link is most content related to the page.
it s very important to set up a good title … and use keywords that are most popular with adsense and pay more per click … like “host’ for example. Try using less junk words like “pr0n” or “free” … as they are the are the least interesting for your clients… especially if you get quality ones with higher interest.
So remember … Title and the keywords in your article define Links in the adsense bar.
See my ads and understand the importance and the difference.