Some CSS tutorials...

The first CSS tutorial I’ve found is http://www.html.net/tutorials/CSS/
It gives step-by-step directions on how to perform the various functions of CSS. Easy to use and easy to find what you need.

The second is http://htmlhelp.com/reference/css/quick-tutorial.html
A very basic tutorial on CSS but it sends the user in a good direction.

The third is http://www.smashingmagazine.com/2009/07/20/50-new-css-techniques-for-your-next-web-design/
It is not so much a tutorial as it is a site that gives you some cool tips and techniques for CSS.
Enjoy!
-Gary