CSS1 Properties
A reference table of CSS1 properties. (Joachim Schwarte)

NCDesign Style Sheet Guide
Property reference, including explanations, sample code, and browser compatibility information.

HTMLHelp CSS Properties
Description of all the CSS1 properties.

CSS2 reference
Complete reference with many examples (including aural ones).

DevGuru CSS2 Introduction
CSS quick reference that describes the style properties.

CSS1 Reference
Complete downloadable CSS1 reference with examples.

WebEnalysis CSS properties chart
CSS Chart displaying the cascading style sheet attributes and properties with possible values.

Index Dot Css
Properties index, examples, and browser compatibility information. Also includes history and links. Part of Index Dot HTML by Brian Wilson.

WebReview - CSS1 Overview
List of CSS1 properties with code examples for each. Registration required.