I'm one of those people who think the Penguin update was just as much about on-page compare to off-site seo, if not more This isn't like the keyword stuffing penalties from before. I think since they see your keywords in your site url, and in you post/page tities, that you really don't have to mention your keywords much in your posts/pages. Really low % density for your main keyphrase, but bring in all the related keywords and spread those out. And like if part of your keyphrase is someone's name, use words like "Her" "She's" "They're" instead of repeating it. Where do you come down on the best use of keyword density now?