I am just coming off from an internal meeting about the ethics and best practices for link building, where the outcome was the affirmation of our desire to create inbound links that are always the consequence of value creation and not of other motives or forces.
More often than not I see how difficult it is for those new to web publishing to attack this front in ways that do not expose them to the risk of hurting their reputation or even being penalized for it. The problem is only one of available info, in the sense that if publishers really knew what their link building options and the consequences of each one were, they would all probably be making the right choices.
In this article by Pamela Vaughan, you can have a good introduction or a pleasant and short refresher of which are some of the best practices to increase your inbound links.
Via Robin Good