I have been looking around for a while at SEO plugins for WordPress blogs and I must say SEOPressor is one of the best I have ever seen. The thing about it is every post you make in WordPress it enables you to make the keywords within your post more relevant and suggests and adds automatically for you keywords to enhance the performance. It gives you a score, and suggests what to do to make the score higher!

Yes, it is already SEO friendly as it is already optimized so you don't have to make effort a lot.