A Retargetable C Compiler: Design and Implementation by David Hanson and Chritopher Fraser
Written in a literate programming style.
A most excellent grimoire.
But if a person is merely looking to bang out a compiler without getting overwhelmed with how to convert NFAs to DFAs for lexing, etc., some good alternative books are:
A Retargetable C Compiler: Design and Implementation, by Hanson and Fraser (http://www.amazon.com/Retargetable-Compiler-Design-Implement...). This book constructs and documents the explains the code for a full C compiler with a recursive descent approach (no flex/lex or bison/yacc). I have some experience augmenting this compiler, so I can vouch for the book's ability to clearly convey their design.
Compiler Design in C, by Allen Holub (http://www.holub.com/software/compiler.design.in.c.html). Downloadable PDF at that link as well. A book from 1990 in which Holub constructs his own version of lex and yacc, and then builds a subset-C compiler which generates intermediate code.
Practical Compiler Construction, by Nils Holm (http://www.lulu.com/shop/nils-m-holm/practical-compiler-cons...). A recent book which documents the construction of a SubC (subset of C) compiler and generates x86 code on the back end.
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