I have been in conversation with Leigh Zeitz lately about EGO. Leigh is an Associate Professor of Educational Technology/Curriculum and Instruction at the University of Northern Iowa. Leigh has just (in May) started the E.G.O. Project blog, and it promises to be a really great resource for people interested in Electronic Graphic Organizers. His most recent post, for instance, talks about the difference between "active" and "passive" uses of EGO.
I encourage you to visit Leigh blog and add your comments about the graphic organizers you use, even if–EVEN IF–you talk about something (gasp!) other than MindManager.