In this BoF I will show the work about Drupal contribution analyzer(will be moving it to d.o these days ;-)), that hopes to be a general tool for helping integrating with data visualization systems. It now supports codeswarm and wordookie. For some examples of the output, see some of my blog posts about it.
opensanta will be also showing some visualization effort he told me today \o/
So, hopefully we could get some more ideas there!