By Erik Small -

If you’re a webmaster or a marketing person managing a website, a simple SEO best practice is to optimize your URL structure. Key phrases are picked up by the search engines on your web pages AND in the URL. But remember, keep the URLs as short as possible and try to structure the URL so the keywords are closer to the beginning of the string.
With many new web technologies and content management systems, they tend to construct URLs with dynamic components and characters, which are unfriendly to the search engines.
Search engines queries are getting more specific, with more keywords in the string. Take a quick read of this article from Website Magazine Online:
SEO for Multi-Keyword Queries