I keep a list of all of the books I've read in the back pages of my paper journal (title, author, date completed, #of times reading it -- and I won't be surprised some day if a prosecuting attorney says "and this list explains everything, Your Honor!"), and I'll occasionally copy a passage from a book into my journal, but beyond that I don't tally them further. I sometimes visit Goodreads to see what the reaction is to a given book, but that's really so personal that it isn't much of a guide for me.

I'm honestly afraid of "quantifying" my reading too much. I think this is what killed my desire to run: I was keeping minute records about time and pace and distance and such, and I was never "in the moment" of running. Each day I had a given number of miles I "had" to run, and I came to dread it. I don't want that to happen to my reading.