If you've missed the CSS Zen Garden, it now has a couple of new designs. On a more down-to-earth note, I've spotted a neat little example of using lists for DHTML menus, and a few tips on replicating HTML tricks on CSS.
Keeping an eye on your system
Want to see CPU and traffic stats without wasting screen real estate? Menu Meters puts the data you want up on the menu bar next to other system indicators.