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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.
The W3C CSS2 Specification (W3C Cascading Style Sheets Level 2 Revision 1, CSS 2.1) is a great resource for searching the defined standards for CSS.