Here’s a list of the top ten most common and outdated SEO mistakes. If you are getting into SEO for the first time, or you are trying to generate more traffic for your site, be sure you are aware of these outdated techniques. It’s important for you to understand that the search engines are constantly updating their algorithms to prevent people from gaming the system and artificially raising their rank in the search engine results page.
This article at Red Hand Studios explains some of these outdated and unethical techniques. Please note that not only are these techniques ineffective, many of them will actually result in your page or site being penalized by the search engines.