Here is my procedure for anyone interested: * I read all books through audio, with the PDF of the book and the Voice Dream app on iOS. * I make highlights and

Here is my procedure for anyone interested: * I read all books through audio, with the PDF of the book and the Voice Dream app on iOS. * I make highlights and notes as I go, then export to a text file when I'm done. So I have the highlights on one hand and the highlighted PDF on the other. * If I think the notes are important, I will break the text file into individual notes and index them with SCAN and/or dtSearch. I've heard DevonThink is perfect for this, but it's Mac only. I could probably integrate spaced repetition here, but I haven't explored that yet. Just my $0.02.