Links are critical for effective SEO. (Free class materials at http://jm-seo.org/2999-n). You need and want inbound links from high PageRank sites, in your keyword community, that are not NOFOLLOW links. One tactic is to reverse engineer your competitors looking for their link ideas, as well as complementary websites. You can also use the Open Site Explorer to measure your domain rank over time, so it should be part of your SEO metrics. Let’s get started!