Keyword density is getting more and more important when it comes to on-site SEO. Since Google's started penalizing sites that are over-optimized, it became obvious that the number of times you mention your keyword on the page you want to rank does matter. And it should be kept low, around 2-3%. When it comes to tools that check the density of keywords, I really like the SEOBook's Free Keyword Density Analyzer Tool -- it's a good-looking one and very easy to use. Free Keyword Density Analyzer Tool Cheers, theguytotheright.