Nortsat my Nigel Slater 30 minute Cookbook is falling apart, as is my Madhur Jaffrey, so it must be those 2. We always have Nigel Slater's roast duck on New Year's Eve if we are in!
Actually, I agree with Mawbe,it depends what for - that's why I have shelves full of cookbooks.
I tear recipes out of magazine, newspapers etc all the time. They get dumped in the basket on my work surface. Periodically I go through them looking for a recipe and discard half the things in there. If we like a torn out recipes it goes into one of my folders in a plastic sleeve. Don't I sound organised!! 