It's kinda funny, the type of book that most interests me in an e-format is the textbook. It costs less and weighs less, and there's no hassle of selling it back because you don't have the shelf space to keep it and anyway, you need the money. Of course, this is coming from someone who does not have the option to rent textbooks (and finds it difficult to be philosophical about my 30-40 pound backpack)........
I haven't become comfortable with using technology to highlight and take notes yet and I haven't figured out how to fit as many documents on my desktop, all simultaneously visible, as I can with a large desk, my bed, or the floor, but I'm still trying.....
