I've been looking for good CSS (stylesheet) articles that don't just teach the basics which I already know. This one looks pretty good so I write it down for later reading.
A List Apart has many good articles for high-level web development. Sadly many of the CSS articles are pretty old so there's (with todays measure) too much talk about non-supporting browsers. I suspect a lot has happened in the last year that will enable me to try the bleeding-edge CSS techniques.