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CSS Tricks is a web design community created by Chris Coyier. This resource includes forums, videos, downloads, code snippets, and articles on all things regarding styling, coding, and CSS.
The Noupe Design Blog will satisfy your curiosity for what’s new and better; this site includes 29 articles on CSS in addition to articles on Ajax, general web design, Photoshop, tutorials on a variety of subjects, and a variety of articles on WordPress. Inspiring recent articles include: “Typographical Inspiration for the Weekend,” “Sexy Drop Down Menu w/ jQuery & CSS,” and recent CSS articles: “50 Free CSS/(X)HTML Templates,” and “15 CSS Habits to Develop for Frustration-Free Coding.
While it is a part of their legacy site now, the New York Public Library still offers up the NYPL Online Style Guide, a basic set of its site's guidelines to set you straight on the basics of XHTML and CSS.