Concept Maps show information visually, and at-a-glance. 

Information is grouped, or clustered, together showing a relationship to the central concept.  The
      main word or concept is put in the center and the links are shown with arrows, often labeled.

Concept maps are good for taking notes, organizing information quickly when brainstorming, and
      developing the organizational structure of an essay or project.

Just like with Cornell Notes, concept maps can be "color coded" to help with the visualization of
       information.  For Example:

  Some other examples and uses of concept maps may be seen here.

  Sources for Concept Map Software:
       Inspiration Software  and  IHMC CMap Tools (The cmap above was created with this.)