wheel - 1:38 am on Sep 17, 2011 (gmt 0)
It ain't that easy any more. You're asking a question so broad that it's like saying 'how do I make money online'.
Some would suggest you read the link building library here, and you should do that. I also suggest you read every thread in the link building forum here going back years. That was something I did years ago.
You're going to need a baseline understanding before you can ask specific questions.
Oh, and go to a pubcon - there's one in November. Beg borrow or steal the money if you have to. At the end of the week you'll have some ideas on how to build links.