TrackBack was first released in August 2002 by the creators of MovableType, and since then, the product has gained popularity among the blogging community (or "blogosphere"). TrackBack is a relatively new framework for peer-to-peer communication and notifications between Websites. With TrackBack, sites can communicate about similar interests and resources.
Although originally developed as a blogger-only tool, TrackBack has recently started to enjoy popularity among regular content sites, such as O'Reilly. In this article, I'll give you a short description of the possible uses of TrackBack, how it works (I won't actually dive into the code), the advantages and disadvantages of the product, and finally a conclusion, including resources that can help you to implement TrackBack in your own sites.