Depending on what your budget is you have a few options. The first is googe add words and yahoos search marketing. They both offer you a free sign up bonus being around 50 dollars and they allow allot of diffrent people to see your add when searching the web. The second if you have the money is sponsoring or paying to have your banner or add put on someone elses site. The last thought is to get in touch with smaller websites and see if you can link exchange with them it has been in my experience that smaller sites can send alot of traffic to your site if you have material that is common with the refering website.