Robots Meta

The Robots Meta plugin allows you to add Robots Meta tags to individual posts and pages in order to prevent indexing of content such as tag and category pages, comment feeds, or other content that you don't want to show up in the search engine results. The main purpose of using this plugin would be to avoid having duplicate content indexed by the search engines. You can download the Robots Meta plugin from http://wordpress.org/extend/plugins/robots-meta/.