CSS resources

[AdidasROXX]

I have been doing web design for 6 years now. And to be honest, I have not touch CSS before. I ahve just started recently (last year) using the <styles> tag, but now CSS looks like a more organized way. Can anybody point me to a GOOD CSS tutoria/resource site? I found some, but which sites was most helpful to you guys?

[mdm]

CSS tutorial:
http://www.w3schools.com/css/default.asp
CSS guide:
http://www.htmlhelp.com/reference/css/

[Joshwang]

or go straight to www.w3.org

[Kaumil]

http://www.sitepoint.com
http://www.devshed.com
http://www.webmonkey.com

Those should be helpful.