Thinking about maps and what they can add to a literary text (and often do) I came across this article collected in “Arts and Letters Daily” (which I find to be a wonderful source generally):

The possibilities of students constructing maps for texts they read responds to another kind and level of engagement of which I wish, over the years, I had done much more.

And going on from there to mind-mapping as a way to connect texts and elements of texts surely could act as
another extension.  Though there are many, the following is a good site to get you started if you’ve not already done so, and it’s easy enough to substitute “essay” for “review.”

And then there’s Franco Moretti’s inventive approach to mapping literary history: Graphs, Maps, Trees, a critical exploration that is quite engaging and provocative.