I just published my article Force-directed graph drawing with PySide which provides a framework to introduce programmers to force-directed graph drawing. It is meant to be educational and I experimented with force-directed graph drawing because of initial joint work with FelixHOer on a Clojure implementation, which did not get completed. Last April I wrote the majority of the article and gave a Lightning Talk at pygraz. I now finalized the article in version 1.0.0 and published it.
Have fun with it!