If you host WordPress on an IIS Server then there is only one choice for URL rewriting, the Binary Fortress WordPress URL Rewriting tool. I have been using it for about 6 months now, but a shiny new v1.0 was released about a month ago. Time to upgrade I think!
URL Rewriting is one of the more critical parts of my attempts at SEO. There are a number of pages that discuss in more detail the benefits of clean links.
People employed to improve SEO have one of the truly great IT jobs I think. There is enough science to provide credibility, it is enough of a black art to avoid direct accountability and the target is constantly moving meaning your contract/role never looks like it has expired. Wow I really am feeling cynical tonight… 🙂