I've just downloaded a trial of BCisive - a business decision making and diagramming tool. First impressions are very good.
When you run bCisive you are presented with a typical workspace in which to model the decision. However the way the workspace is designed has real impact and yet is fresh and clean.
Building a decision tree is quick and easy and I will experiment more with this. I see great potential for using this interactively in business meetings, workshops and group consultations.
The web site offers some great support - with tutorials for beginners, case studies and sample decision maps. This feels like a winner.