1) Have text links on your site embedded into key words, Text Link Ads are unique because they are static html links that can drive targeted traffic and help your link popularity which is a top factor in organic search engine rankings. You can also earn an income from the advertisements.
2) Purchase Text Links to drive traffic to your site by placing advertisements on other sites. You can read and learn more about these option by simply clicking on the banner in the left hand side bar.
Keep in mind these techniques are more to do with improving your search engine rankings than finding qualified business prospects, which of course is the main reason for having your site. You just have to be able to get them to find you in the first place!