While other tips correctly say "don't encourage your readers to click your ads" that is not exactly correct. You do want to encourage them; you just don't want to say so. Let me explain.
If you design your page and your text to "encourage readers to click ads" then your click thru rate will go up and you will make more money. But you can't be direct about it -- you can't tell them to click ads.
For example, you can end your paragraph with "The next chance you get, try out some of the retailers who advertise on the Internet, and see how their websites are optimize for selling" and then follow with your adsense block. It serves to "encourage" them to click the ads, without actually asking them to. If the ads match your topic area, it is easy to write such an inducement. Try it! It works!
-ngan
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