This comment on Kindle reading by Nora Ephron really made me stop and think:
You know, the older I get, the more I understand what [Marshall] McLuhan meant when he said, “The medium is the message.” I didn’t really get it at all when I first read it, and now I’m very conscious of it. For instance, when I read a book on a Kindle, I’ve noticed that I’m more impatient. Because I’m turning the page so often, if something hasn’t happened, I think, When is anything going to happen in this book? You become way more obsessed with plot than you would if you had an actual book and you understood where you were in that book. That little percentage tracker on the bottom of the Kindle screen is not a helpful thing. You can’t go back when you’ve forgotten who a character is. So I’m very conscious of how that medium changes the reading experience completely.