Remember the package dependency graph of z3c.formdemo produced by tl.eggdeps?

z3c.formdemo dependency graph (small version)
the insane graph, scaled down from 14153x2729 to 480x93

If you filter the dot file through tred from the graphviz suite of tools, it will remove redundant dependencies (that are already implied by transitivity) and produce something actually useful:

z3c.formdemo dependency graph filtered by tred (small version)
the useful graph, scaled down from 2695 x 2394 to 480x426