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Starting with HTML + CSS teaches how to create a first style sheet. For a quick intro to CSS, try chapter 2 of Lie & Bos or Dave Raggett's intro to CSS. Or see examples of styling XML and CSS tips & tricks.
Also on this page: English and non-English articles, discussion fora, books, and secondary resources.
Jens Meiert
maintains a list of CSS
properties, including those in working drafts, with links to
the relevant specifications.
Mailing lists and Usenet News groups.
A selection of books on CSS (in no particular order). Note that I have not read most of them.
Heiko Stiegert, CSS-Design – Die Tutorials für
Einsteiger (Galileo Design, 2008, 978-3-8362-1155-0)
[in German].
Håkon Wium Lie & Bert Bos: Cascading Style Sheets – designing for the
Web “written by the creators of CSS” (3rd edition,
Addison-Wesley, 2005, ISBN 0321193121). See errata. [CSS 2.1]
Resources that catalogue links to other resources. (Which makes this list a tertiary resource… )
The slides of all (public) presentations given by W3C staff can be found on the W3C Talks page.