Link Building Blog, News and Articles - Textlinkbrokers.com/blog

Don’t over look this form of on site optimization. This comprehensive article on seoconsultants.com outlines the many ways you can optimize your URLs.
Read the article. http://www.seoconsultants.com/articles/1000/urls.asp

Not covered in the article is the practice of using one host name to align both http://example.com and http://www example.com. This will ensure that your site receives the highest page rank benefit, because all your inbound links are counted together. This is very important if your site has a lot of natural links.

Scrivs has a good post explaining this.
Read Article