I don't know if someone told you, but we now live in a link economy. You might have great content, you might even be a big brand from the pre-web era, but unless many many websites and blogs link to you, you are not going to show up high in the Google search results. And if you don't, it is like you are not even around.
Links are all the rage. Links are the currency that the web economy thrives on. Link building is a fundamental activity. If you are convinced link building is important, and are now looking to learn how to do it, one great option you have is to visit LinkBuildingWiki.com that lists hundreds of articles, blogs, and websites that will help you with the exercise.