Normally I'd just use OmniOutliner/Grapher to make a taxonomy for
personal use. Now I find myself wanting to share my
taxonomy-in-progress so that others can mark it up.
Does anyone have a favorite (and simple/cheap) tool for doing this sort
of thing that they would recommend? It doesn't have to be a particular
fancy poster, just something that I can scale up/down based on how big
the graph is.