An interesting paper about note-taking and hypertext (not necessarily in that order): The Magical Place of Literary Memory™: Xanadu:
"I was continually trying different systems for organizing ideas. File cards... were clearly hopeless. I tried index tabbing, needlesort cards, making multiple carbons and cutting them up. None of these solved the basic problem: an idea needed to be in several places at once... but then, in graduate school, I took a computer course" (Ted Nelson in 1992).
Without further comment!