Do-it-Yourself Search Engine Optimization (SEO) for Your WordPress.
Industrial Marketing Today
MAY 31, 2010
Here’s a screenshot of my setting: Changing permalinks after your blog has been live for a while can cause you to lose pagerank in search engines and generate “404 page not found” errors. Search engines use it to display it in search results and their algorithms use it to determine what your blog post or page is about. . –
60 
Let's personalize your content