WordPress is one of the most widely used blogging and publishing system on the Internet. WordPress has a wide no no huge variety of plugins that gives sites a much needed boost in the search engine rankings.
WordPress performs really well when it comes to SEO and search engine results page (SERP) rankings. Out of the box, however, WordPress has a ton of duplicate content problems. For instance, if you’re not using excerpts on the home, tags, categories pages and you are displaying the entire post, that post is being shown not only on the homepage but also on the category, tags, and archives pages too. Google and other major search engines don’t think too highly of that and your search rankings will therefore suffer. Not to worry there are plenty of WordPress SEO plugins available to help you optimize your WP blog. Below are all the plugins, that I am aware of, that are aimed at improving WordPress SEO.
WordPress Import Posterous Users – Graduate Full Blogging
WordPress Integrates With Twitter API To Makes Blogging Easier
Best SEO WordPress Plugins
WordPress Expert Resources, WordPress Plugins, WordPress Tutorials