i've been a user of novamind on and off for a few years - my typical workflow goes like this
- 'brainstorm ideas' into nova mind
- play around with the mind map untl it looks right or i can't take it further
- export the mind map fom nova mind as an .opml file
- open it up in omnioutliner for further refinement
- export outline to word processor for further refinement
i don't really see how this would involve omnifocus, but i guess the opml file could probably (although i've never tried it) be imported or inserted into omnifocus.
but mind-mapping inside omnifocus? i think that would make it a very strange creature.