A few years back I helped John Eberhard get educated in the techniques of search engine optimization, when he was starting his Real Web Marketing company. He does good work in SEO and web marketing now and he sends out a regular newsletter that I always read when it arrives; it is usually packed with good info and he summarizes the state of things very well. He recently put out a list of tips for website link building that was fairly complete and worth reading and doing. Recommended reading if you do any link building or are trying to figure out how to get started down that road.
I have very few sites bookmarked to which I refer my clients for link-building ideas. Rachelle Money wrote an article a couple of years back after interviewing Eric Ward, who runs a master class for link building. The resulting advice on link building is also worth reading.