Dan Cederholm's article demonstrating how to get nicer rounded corners with CSS.

A method for creating alternating colors in table rows using JavaScript and CSS.

Nick Rigby's article on using lists, CSS and a little JS to create fly-out hierarchical menus.

Anyone who has created drop-down menus will be familiar with the large quantities of scripting such menus typically require. But, using structured HTML and simple CSS, it is possible to create visually appealing drop-downs that are easy to edit and update, and that work across a multitude of browsers, including Internet Explorer. Better still, for code-wary designers, no JavaScript is required! (Actually, a tiny bit of JavaScript is needed, but it’s not what you think.)

Sergio Villareal's article in ALA shows how to create soft CSS drop shadows using PNG alpha channels.

Part II of Douglas Bowman's series on using CSS to create tab elements using CSS, this time showing a new scenario where no tab is highlighted, combine Sliding Doors with a single-image rollover, provide a fix for the clickable region in IE/Win, and suggest an alternate method of targeting tabs.

Douglas Bowman gives an excellent tutorial on layering background images, allowing them to slide over each other to create certain effects, such as tabs.