Keyword density

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Although Google doesn't release exact details as to how they determine the ads to serve on a given page, they do tell us that it's the text content of the page that matters, not the meta tags. Before serving ads on a page, then, you might want to check its keyword density. A good, free tool for doing this is found here:

Keyword density analyzer, and keyword placement & prominence analysis

This lets you fine-tune the page before exposing it to the AdSense crawler.