How to Use the Google Keyword Tool to Pimp Your Web Page
For all the search engines, and maybe especially for Google, topical relevance is everything. The words on your webpage will get ranked for relevance on one or more topics or categories. There are probably 100 or more other factors that go into a Google ranking, most of which we will never know, but the major ranking factor has to be the words on your page and their proximity to each other.