Though a pretty old one, Tim Caswell‘s articles on JavaScript and the Object-Oriented(???) concepts are really popular and worth having in your bookmarks list.
The three series article that talk about object graphs in JavaScript are given below.
- http://howtonode.org/object-graphs
- http://howtonode.org/object-graphs-2
- http://howtonode.org/object-graphs-3
Tim Caswell’s site serves as a very good source for Node JS developers as well.