Brainstorming tool for research concepts

We are still in the testing phase within our RoR Radar group, but the initial impression is that mind42 is a very promising tool. It makes use of the mind map concept but, in contrast with computer-based tools that were limited in terms and a few other Web-based tools with a not so good usability, mind42 seems like a very good tool. Our RoR Radar group is now testing mind42 to brainstorm about the central concepts of a couple of research papers, and we will report back after we get some more hands-on experience with it.