iMapping presents itself as a new tool for personal information management. It is supposed to have advantages over mind maps (cross links or Querverbindungen) and concept maps (hierarchical structuring at arbitrary depth), and its approach is presented as a new method. I cannot decide whether it is a radically new approach, as I have not tried it. But I am skeptical. The application needs Java 6 to run. You can download it here.
Warning! The Website is written in German. The same seems to hold for the application's interface.