Yes, I read about this script several other places, but alas it's nowhere to be found.
This page has a link, but it doesn't work.
I ended up trying to make a (more or less successful) table using OmniOutliner and a
sample document (from the
OmniOutliner extras page)that wasn't too far off from what I wanted.
Still, that OmniGraffle script sounds interesting -can someone who has it upload it to somewhere, please?