How often do you stuff keywords on the META keywords tag on your html pages? Now Google officially says that Googlebot pays no consideration of META keywords tag for your search engine rankings.
This is how typically a meta keywords tag would look like
<meta name="keywords" content="keyword 1, keyword 2">
Matt Cutts, the famous Google engineer clarified the issue which often confuses webmasters and SEO experts. Now we have an official word from Google that Keywords Meta Tag are not used at all!
Next time some SEO article tries to convince you optimize the meta keywords tag, remember Googlebot will not even bother to index and interpret those keywords, but rather extract keywords from your content.