CSS Panic Guide This helpful resource from The Noodle Incident is a compliation guide to all things CSS.
PVII Dreamweaver Extensions, Tutorials, Templates, and FAQ Quick Draw MacFly is the latest Project VII article and it is a dandy explanation of how to create a page using CSS that will display nicely in Netscape 4 and in more modern browsers as well.
Many stylish tips for making interesting headings using CSS are provided in this WebReference article by Christopher Schmitt, Making Headlines with CSS. Trying all these techniques would make a handy lab exercise for students.
All CSS Properties Listed Alphabetically This was so nice to find! Just when I was trying to figure out what border-collapse was, this great new resource appears. Maybe next I’ll work on counter-increment. No, include-source looks interesting. Wait, what about page-break-after? Oh, oh, there’s ruby-align. I love this place.
SelectORacle This cool tool lets you enter some CSS or a URL to find out in plain language what CSS selectors are actually selecting.
CSS2: Mix and match classes A quick and clear explanation of how to apply more than one CSS class to an element at a time.