WP SEO BEAST : a great WordPress blog plugin at a great price.
Rates your posts on a scale of 1-10 and tell you exactly what you need to do in order to achieve the top rankings.
Checks for keyword in the first and the last sentence and tells you if there is something that you must do to get higher up in the SEs.
Suggests a linking strategy inside the post that is 100% guaranteed to work and taught by the top SEO Gurus. No other plugin has this feature so this is a completely unique thing to WP SEO BEAST.
Lets you edit the Title, Description and Keywords that the search engines see.
Includes the Secret Code that is in accordance to the Google and Yahoo algorithm. Updated after considering the impact of the content farm update on websites so it is very latest and unique to this plugin only.
Checkout WP SEO BEAST here.