While we're on the topic, though, what are some resources that are good for experienced programmers to really learn the semantics and best practices of CSS? All

While we're on the topic, though, what are some resources that are good for experienced programmers to really learn the semantics and best practices of CSS? All of the information I tend to find is either more focused at getting absolute beginners started or on the actual design aspect and not so much the mechanics. Basically, I'm hopeless to ever actually design something beautiful, but if something beautiful is shown to me, I'd like to be able to replicate it with CSS and not have to $(document).ready() the crap out of it because of my poor understanding of CSS.