MindNode Pro – Easy Mind Mapping for Your Mac
http://www.mindnode.com/

MindNode Pro and MindNode are elegant and simple-to-use mindmapping applications for the Macintosh that help to visually: a) collect, classify and structure ideas; and b) organize, study and solve problems. Mind maps can be used for many different tasks – including to-do lists, brainstorming, holiday planning, research, writing, project management – and in many different environments – school, meetings, workspace. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.