My favorite endgame book has to be Van Perlo’s Endgame Tactics: A Comprehensive Guide to the Sunny Side of Chess Endings. I think I first read this book when I was rated about 1000, and even though I am nearly twice that now, I still love to look through it and review endgames ideas and techniques. The organization of this book is superb, and the way it groups positions helps teach/reinforce pattern recognition. In the first edition (the copy I own), Ger Van Perlo covers over 1000 positions, and if you work with the book correctly, then you will learn something new every time you open the book. There are some subtleties in each position, and as you become a stronger player, you will be able to pick up on these ideas. I’ve owned my copy for at least five years (probably more), and its a worthwhile read. I know that a second edition has been published recently (2013), and while I have never seen this book in person, if it is anything like the first edition, then it is a great buy.