Punishing and Correcting Joseki Mistakes
AndyPierce: Good book. Probably worth 1-2 stones with careful study at my level (5k).
GoStone: I bought it as an 11 kyu and it is very interesting. I find the book a little hard to follow at times because it jumps back and forth between actual games played by kyu players and examples of correct joseki. I think that is a hard way to present information without confusion. The book succeeds in giving examples of ways to correct common mistakes in joseki and punish them if you see them being committed. It's a bit textbookish but I found it extremely useful. If you can handle a dry book then I recommend it.