Warning about Keywords

The Meta Keyword Tag is no longer read by Google or Bing..
Google:
http://googlewebmastercentral.blogspot.com/2009/09/google-does-not-use-keywords-meta-tag.html
It can hurt you more on Bing:
http://searchengineland.com/the-meta-keywords-tag-lives-at-bing-why-only-spammers-should-use-it-96874
And use of it can hurt you as it is one of the clues they use to determine if a site is spamming..

http://wordpress.org/plugins/wordpress-meta-keywords/