Cascading Style Sheets (CSS) By Example
Uses a fast approach to make CSS accessible to everyone.
Cascading Style Sheets - Designing for the Web [Fi
By the authors of CSS1.
Cascading Style Sheets - Seperating Content from P
By Owen Brigss, Steve Champeon, Eric Costello and Matt Patterson.
Cascading Style Sheets For Dummies
The Dummies guide to CSS.
CoreCSS.com
A book covering all individual CSS1 and CSS2 properties (with browser-compatibility charts) as well as Internet Explorer CSS extensions. Also provides a look at what's coming in CSS3.
CSS Pocket Reference
Introduces CSS and lists all CSS1 properties, plus the CSS1 pseudo-elements and pseudo-classes.
Eric Meyer on CSS - Mastering the Language of Web
Practical guide to CSS by Eric Meyer. Published by New Riders.
HTML Utopia: Designing Without Tables Using CSS
Describes how to use CSS instead of tables for layout. First 4 chapters available as a download in PDF Format.
Learning CSS: Books
List of books on CSS from the W3C's CSS page.