Good Books on Compiler Programming?

Josuah asks: "I just started my CS164 Compilers class at the University of California, Berkeley and the book we are using is called Compilers: Principles, Techniques, and Tools by Alfred V. Aho, Ravi Sethi, and Jeffrey D. Ullman, published by Addison-Wesley. Our professor told us today that the book kinda sucks because it is old (1988) but was unable to suggest a better book. Does anyone know of a good book on modern compiler programming? "