Despite a terminally confusing display and interaction, Lucas Gonze and Olivier Nerot have teamed up to provide a tantalizing Java based visualization that provides interactive maps of Webjay's playlist space.
Memo to social software folks, there might be a network in your system, but network visualizations are notoriously hard to make comprehensible. You're probably better off looking at other types of displays that are driven by results gleaned from network analysis.
But they do make pretty good eye candy!!
Microupdate added visualization apres Lucas Gonze's response.