Persistent Uniform Resource Locators or PURLs can take many forms. Typically software that I use like Wordpress has this functionality built in, but they call it by a different name Permalinks like the one for this article http://www.365webapplications.com/2009/12/15/what-is-a-purl, which you can see in your browser above. It is much more friendly than the database link http://www.365webapplications.com/?p=724. In SEO you want to sure you efforts don’t get lost over time, by using these in conjunction with search engine and human friendly names. Like http://www.365webapplications.com/category/review/, which regardless of the year would always show the latest reviews. Also archives would have similar forms like http://365webapplications.com/2009/10, meaning show all articles from October 2009.
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