Hi there
I love Ommnigraffle and the possibility to draw a graph form its hierarchy using the structure to add idea
Have you considered the treemap layout ?: it is also a hierarchical layout
I would really love to brainstorm using this layout : advantage all the information always fit on the page
(see
http://www.cs.umd.edu/hcil/treemap-history/)
But I don't know if graphviz can do this
Many thanks in advance
Keep on with the good work
Jean-Luc