The techniques of study are endlessly fascinating, though a good way to divert one's attention away from actually doing any work towards the way in which one might do some work if only one had the right pen/notebook/computer/time management system.
Two things caught my eye recently:
Keith Thomas in the London Review of Books, discussing a historian's note-taking techniques
Tara Brabazon, in Times Higher Education, with very practical advice on editing essays and not-taking