If you want top ranking positions in search engines you must have many link pointing to your site (Backward links). It is not only important to have many backward links but also to have those links placed on sites which have themselves many backward links.

One of the most popular and cheap method is link exchange. This method consists simply in putting a link on your site from your exchange partner. In return, your partner will put on his site a link pointing to you.

The list above provided a list of directory to which you can submit freely your site's url. To keep a certain quality to their directory, these directories migth refuse to list your site. Check each directory to ensure your site is adequate.

You can also obtain many backward links is with a pay-per-click advertisement program which advertise on many different sites like Google AdSense. There is also an original program called Co-op Advertising Network. In fact, this program combines link exchange and banner advertisement. You simply put a banner on your website displaying other member's website advertisement and your banner will be, in exchange, displayed on other member's website.