I found this site about CSS and the thing that I really like about it are all the different things it links you too. There are basic tutorials, references, forums for fellow users that have questions and a couple links to pages with some nice examples of work done with css. You may have to explore a little bit to find the good chunks but I think it will be a good reference point too future questions and even some we're having now.

http://www.webstandards.org/learn/external/css/