Web Directories are best way to market your website. By submitting to the webdirectories you can easily get one way back links. As most of webmasters know that one way backlinks is the best idea to promote a website. Different search engines including google treat links as a vote. If you have back links from an old site with high Page rank then it will pass you its authority and rank as well.
This will result in an increase in your site promotion too. There are 100’s of free directories where you can submit your website for consideration. Once there admins approve your site you site will then start appearing in the proper category of that website. Advice is that you submit your site in the correct category for authors to approve it.