I recently received an email from the folks at Personal Brain announcing version 5, which among other things, provides the ability to import MindManager maps. It's now possible to use MindManager for organizing thoughts in a structured map and then, if desired, import that structure into a brain and connect those thoughts to others in the Plex.
I already use both MindManager and Personal Brain, (both are Lotus Notes enabled) with eProductivity. I find that each tools helps me visualize my ideas, knowledge, projects, and actions in useful ways.
Now, with the added capability to import maps, I have yet another useful tool in my productivity toolkit.