If I reeeeally like a book (examples include: war and peace, accelerando, 100 years of solitude, neuromancer) I usually read it halfway through, put it down for a while, sometimes a week, sometimes a month, sometimes a year or more, go read lighter or non-fix stuff, write and contemplate on the book I'm ruminating over, then go back and read it from the beginning, all the way through. I love doing it like this. During the rumination period I often go back and look up specific passages in the book to accompany my thoughts.