I've used for a little while "SEO Ultimate" for Wordpress. Unfortunately the plugin demonstrated itself to be buggy and without a solid infrastructure on the back that would allow easy overriding of their functions.
Last but not least, their module called "link juggernaut" is a piece of cxxp as it links pages themself when it shouldn't and the most recent change that switched links presence from # to % utterly created more problems than ever.
In the end I moved to a different plugin. However, although the plugin removal, it appears the deep link juggernaut module are still doing something as I got my plain words converted into links without the link to be really there (not in the content at least).
Did anybody come across the same problem and found a solution?