If you study search engine optimization (SEO) you know that how you rank is at least partially based on how many sites link to you. Fortunately there are some great tools that help you trade links with other sites, thus improving your placement with the search engines. This is called reciprocal linking. I'll put your link on my website if you put mine on yours. Some of these services that help you trade links are free and others have premium memberships. There are even services that can automatically update your website with new links. I prefer to handle mine manually, but each to his or her own.