here is my list for top css support resources:
[if it aint at one of these sites...it aint]

great site for learning to write css ---
w3schools css reference and tutorials

excellent reference and specification site ---
w3c css home page

a nice handy css1 reference ---
css1 reference

a list of list-making css styles ---
listamatic

a css level 2 [css2] specification page ---
css2 reference page

css compatibility table ---
css2 support for browsers


by the way...
css is short for cascading style sheets.
it is a structuring mechanism for adding and defining style such as fonts, colors, spacing, layout to web documents.

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columbus ohio web site design . residential architects in columbus ohio . non-profit url : club relaxzoolander
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Excellent resources relaxzoolander

I got a few more. They are very very usefull. You might wanna have a look

here they are taken from WMW:

Introduction - What is CSS?

Font Control - Selectors and Basic Syntax

Color & Background Properties

Text Properties - Pseudo Classes & Pseudo Elements

Hope they help

Sunny

The resource listamatic that relaxzoolander mentioned I found extremely useful. Also Guide to Cascading Style Sheets when you're starting from scratch