With the arrival of my MacBook Air, I can’t justify forking out another US$250 for MindManager, especially as it is one version behind the Windows one, so I’m trying some alternatives.
Freeplane seems pretty good and is a re-write of Freemind, which I also like. Both Java-based so run well on Mac and PC. Both open my existing MindManager maps well (I never did complicated things with them) so I’m a happy camper, currently.
Update: ThinkingSpace seems to be a good Android mind map editor.