1. dmoz.org
  2. Google Directory
  3. Yahoo Directory Yahoo! Directory Submit is part of a suite of services created to help businesses like yours get more out of Yahoo!, more efficiently. Whether you’ve submitted to the Yahoo! Directory in the past or are a new user, Yahoo! Directory Submit provides expedited review of web sites you propose for the Yahoo! Directory.
  4. Best of the Web! Internet Web Directory organized by category, offers content rich and well designed web sites. Submit URL for editor review and have your site listed within the Best of the Web Directory. Submit to BOTW
  5. Business.com business search engine and business directory designed to help its users find the companies, products, services, and information they need to make the right business decisions.
  6. About.com