Choosing The Best CSS Framework: A Complete Guide | DevSnippets.
Good article and one that you may want to refer back to many times. It also shows some flashes of CSS3 right here on this page.

Css and Web Design Community News.
Good source of CSS stuff. bookmark it or subscribe to the feed.

CSS3 Techniques You Should Know.
Great article to get you started on picking up some CSS3 and use it now.

geuis’s helium-css at master – GitHub.
interesting…

22 Advanced CSS Text Effects And Web Typography Tips
A good compendium of recent CSS posts that I’ve seen. CSS3 is going to be simply awesome, perhaps as awesome as HTML5.

Create a Letterpress Effect with CSS Text-Shadow.
CSS3 is going to be so freekin awesome. Cannot wait until browser support is with it. Yeah… IE.

Coding Clean and Semantic Templates.
a good article. so many times a woman applies for membership on the mailing list, I look at their portfolio, and I see “div-itis” and yet they say they know CSS. If they did, they’d not have a whole article written just for them. Most just allow Dreamweaver to do their [...]

Ultimate Guide To Grid-Based Web Design: Techniques and Tools – Noupe.
This article is outstanding. It truly is an ultimate guide! I delicious’d it, and gonna go thru it on my web development weekend! Sweetstuff.

Those very nice people at Litmus (the site and email testing service) have launched a free help site called Doctype. It’s a question and answer site for those of us whose profession requires regularly wrestling with CSS esoterica.
Here’s what they say:

Each question has browser (or email) compatibility screenshots
All content on Doctype is editable so it’s [...]

250+ Resources to Help You Become a CSS Expert | Webdesigner Depot.
They always have good stuff. This list is big and hefty, so bookmark and read at your leisure or as you need.