
Cascading Style Sheets Specification
Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g. fonts, colors, spacing) to Web documents.

Code Beautifier: CSS Formatter and Optimiser
Code Beautifier: CSS Formatter and Optimiser is an on-line CSS parser and optimiser which will take you style sheet from a URL or or direct input and optimize it to reduce download time and improve browser performance on your web site.
If you are looking for help making the transition to CSS layout (that's Cascading Style Sheets), you've come to the right place.

css Zen Garden: The Beauty in CSS Design
The css Zen Garden invites you to relax and meditate on the important lessons of the masters. Begin to see with clarity. Learn to use the (yet to be) time-honored techniques in new and invigorating fashion. Become one with the web.
What is this? It's a challenge, an experiment, an exploration, a rough map of where we haven't been. It's a search for new ways to approach Web-based design. It's a cry for creativity, and a stab at innovation. It's a playground and a proving ground. It's a rejection of what's practical in favor of what's possible.

Listamatic
Can you take a simple list and use different Cascading Style Sheets to create radically different list options? The Listamatic shows the power of CSS when applied to one simple list using samples from Eric Meyer, ProjectSeven, SimpleBits, Jeffrey Zeldman and others.

Unmatched Style
Unmatched Style is a constantly growing community dedicated to acknowledging those who have made exceptionally gorgeous web sites, using the methods we feel to be the only acceptable way.

W3C CSS Validation Service
A free service that checks Cascading Style Sheets (CSS) in (X)HTML documents or standalone for conformance to W3C recommendations.