Olivier Langlois's blog

I like this book because it is a good compromise between lex & yacc man pages and the theory found in books such as the Dragon book. You will get valuable information about the how and why of the tools that will help you to produce a quality grammar without being overwhelmed by details.

This is the classical reference book for compiler design. This is not an easy text because of its heavy use of mathematical notation and the algorithms are presented only in pseudo code but you will not find a more complete collection of compiler related algorithms than in this book.

There is a new edition that I have not had the chance to review.

This book is more accessible than the Dragon book but is less complete. This book presents complete source code for parser generators tools and a C compiler. Even if this book is getting a little bit old and it targets a DOS platform, it should not stop you from acquiring this goldmine of very useful information for anyone interested in compilers for a very reasonable price.