Trade articles, not just links, with other web site owners. While your competitors are slowly trading just one link at a time, you can blow by them by getting multiple links at once by providing quality content in the form of articles to other web sites.

From Stomper newsletter.

A practice our main site has been completely focused on for the past 6 months with unbelievable success. We are in the top 3 on close to half of our 850 target keyword.