Directory submission is one of the best well-known internet marketing strategies to start promoting a new site. Having your site listed in directories helps to increase your targeted traffic, as well as boosts your search engine rankings.

Here is what Google's Webmaster Guidelines say:

" How can I improve my site's ranking?

•  In general, webmasters can improve the rank of their sites by increasing the number of high-quality sites that link to their pages.

When your site is ready:

• Have other relevant sites link to yours.
  
• Submit your site to relevant directories such as the Open Directory Project and Yahoo!, as well as to other industry-specific expert sites".