The giant directories like Yahoo and Open Directory are by far the largest traffic generators on the Web. Using keywords that apply to your Web pages, search these and other large directories to see which Web sites come up first. That's where you want your Web site to be. Don't overlook the specialized directories. For small businesses and professional practices, the smaller directories often offer the biggest bang for the Internet marketing buck.
Some search engines charge by the click rather than a flat fee.
These can also generate good results for small professional firms, especially at the beginning of your marketing campaign when you haven't yet obtained a listing on many search engines. Use PR to promote the site. Contact local or trade publications whose readership might have an interest in your Web site. Editors are often hungry for reports on new and interesting Web sites. Stay focused on the goal.