This video is from Matt Cutts, a member of Search Engine quality group from Google. The video provides the key points on how to have an effective organic link. This demonstrates that good content is not always the basis for good links but also it needs to have the following:

• Write something controversial but not frequently
• In order to be successful you need to participate in the community like answering questions in the forum
• Write/ create original research; do testing and experiments and compare
• Provide a good piece of advice; get a blog and write your ideas List How To’s; Supply tutorial
• Provide Services like supplying open source
• Make a good site architecture; make easy to linked your website
• Create few videos; make it easy and enjoyable