Debra Mastaler posted an article on Search Engine Land about Link Building Basics.
She explains what Link Popularity is (covering Link quantity, Link quality, Anchor Text and Relevance) and why Link Building and referral site development is such an important activity for improving organic search rankings, building targeted traffic and building brand awareness.
For More Info
Offsite and reciprocal linking effects on search engine marketing. What we recommend regarding outbound links from a web site (offsite links) and the related area of reciprocal linking.
12 Steps to Building Incoming Links. In the WordTracker blog Ken McGaffin outlines 12 principles to follow to show quality web sites that you are worthy of their link.
Best Practices for Article Marketing. Why submitting articles to article submission sites is of little value unless they are high quality, useful articles. How to find quality article submission sites.How to build & use an online media list.(A two part article)