Absolute BEST CSS Resources
I'm delving into CSS. That is to say, really deeply into CSS; I know the basics, but I want to go all out, so to speak. However, many of the sites I've been using are somewhat outdated (Webmonkey's CSS Reference Sheet hasn't been updated in about two years)! I've been to richinstyle.com, which is helping tremendously, however I'm not finding much on bordering, layering (really need some help here), as well as floating elements, etc.
So, could everyone list their best CSS Resource that they know of, that is up to date, and has CSS1/CSS2 examples and tutorials?