The interactive graph is cool.  Some suggestions:

* Mark nodes of dependencies you want to prune in red.  

* Allow nodes to be pinned

   * http://bl.ocks.org/GerHobbelt/3637711

   * http://stackoverflow.com/questions/11584757/interactively-fixing-a-node-in-a-directed-force-graph 

   * http://stackoverflow.com/questions/12496851/d3-force-graph-sticky-nodes

   * http://bl.ocks.org/mbostock/3750558

* Node size to reflect size of package. A small number of dependencies to a fat node might be best to tackle first.

* Highlighting & Fisheye

   * http://www.coppelia.io/2014/07/an-a-to-z-of-extra-features-for-the-d3-force-layout/

* Mark in bootstrap-dependency-report-graph-data.csv which dependencies you want to eliminate, so that others might have a play with visualisation.

More exotic...

* Serve the bootstrap-dependency-report-graph.html and bootstrap-dependency-report-graph-data.csv out from Zinc, so I can point my browser at my local Pharo Image, and when a dependency is deleted, the graph updates automagically

* When I double-click a node in the graph, it selects that item in the dependency analyzer in Image.

* I guess the same might be done with two local Images - Moose as the observer and Pharo as the subject.