Article Posting, Guest Posting + my personal favorite Forum Posting is best for Increasing Quality based Backlinks.

SEO techniques like guest posting, article submission, blog commenting, blog posting and business listing submission are very effective for building quality backlinks for a website.

The best directory for backlink is dmoz.org

I have tried using google webmaster tools links to your site feature, it should some sites, but its just weird that it did not list any RSS submission sites has back links.

forum posting and social networking sites are best way to generate traffic

Quality Backlink or Quality Content?
 

Even after getting hit and penalize by many Google updates, i'm happy to know that you are still able to take more update hit, 3 Cheers for you. If you really don't want to get hit, stop asking this type of question "where can i get quality backlins?" Don't do this with your SEO Profile :no:

Ask: "Where i can share Quality information?", the place which requires you to give some quality information from getting approved for the posted content are the trustworthy site to get reference from. Always try to give more information instead of just for the sake of Linking.:)