A List Apart :: explores the design, development, and meaning of web content, with a special focus on techniques and benefits of designing with web standards.
css/edge :: Eric A. Meyer's CSS
site with a selection of examples.
CSS Beauty :: A showcase of
well-designed CSS based websites from around the world. It's a great place
to find inspiration for your own designs.
CSS Vault :: Another great site to
explore for inspiration. It also has links to articles about CSS design.
Everything you ever wanted to know about how to style lists.
Position is Everything ::
If you want to try a new layout using CSS, this is a good place to start.
This site has just about everything you'll need for a variety of different
layouts, including the workarounds you'll need for buggy browsers.
The CSS Spec :: Very technical,
but hey, it's the definition of CSS. This is the official documentation
for CSS at the W3C.