This is not a CSS how-to book but design book showing how powerful CSS can be. It is a companion to the www.cssszengarden.com web site.
This is a great learn-by-example book. The book has 13 projects, extensive code and a web site where you can download the complete files for all the projects.
This book contains 10 more projects including a design Eric did for the Zen Garden.
This is a must for ny web designer's book shelf. It is a comprehensive CSS tutorial and also contains a 160 page CSS Property Reference.
This book presents 101 problems then provides solutions designed to work across the various browsers. It is a great reference to find solutions to specific problems you face.
This is a great intermediate book on CSS. It is one of the best guides to browser bugs, hacks and filters.