Before the web came hypertext.
And before hypertext came mind maps.
Mind maps were developed in the late 60s by Tony Buzan as a way of helping students make notes that used only key words and images. They are much quicker to make, and because of their visual quality much easier to remember and review. The non-linear nature of mind maps makes it easy to link and cross-reference different elements of the map.
Peter Russell joined with Tony Buzan in the mid-70s and together they taught mind-mapping skills in a variety of international corporations and educational institutions.
Clickable Mind Map of earlier version of this site's home page