I've always thought if you build a nice site, with lots of good content related to your central theme, the search engines will rank you appropriately. But it turns out there's much, much more to consider when optimizing your site for the search engines. Here's an article presenting the "collective wisdom of 37 leaders in the world of organic search engine optimization". It's quite lengthy and involved, but great reading if you're wanting to know what you can do to help your rankings in Google:

SEOmoz - Google Search Engine Ranking Factors

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