I'd always thought the mantra was "Reduce, Reuse, Recycle". Essentially the benefit of a reader is that you can reuse, which you can't with a book (well sort of). Which or p- or e- books makes sense probably depends on the number of books you read, and how long you will hold onto the device. If you are the sort of person who reads three or four books a year, and throws your gadgets into the bin (or leaves them in a drawer) after 6 months to get the newest model, p-books are probably better....
