[X-Newbies] Mind Mapping

[Tony Johansen]

Is anyone aware of any serious mindmapping software to work on Mac OS X ?
MindManager seems almost perfect but (gasp) they choose not to make a Mac
version. I found Inspiration but it appears aimed at students and kids. And
various offerings on the net seem to lack Mind manager's flexibility etc

Is there actually one that is sophisticated enough for adults?

Tony