Just a few days after Yahoo! announced their new Search, Douglas Bowman took it upon himself to “markover” what they had using nothing but pure, clean XHTML and CSS. The result should have Yahoo! scrambling to hire Doug to improve what they’ve just updated.
Specifically impressive is the manner in which the vertical tabs were handled, using CSS — a great example for anyone trying to do something similar.
CSS3 For Web Designers Paperback + eBook A Book Apart
Bulletproof Web Design Third Edition New Riders 
Handcrafted CSS Book and DVD New Riders 
Web Standards Solutions Special Edition Friends of Ed 
Dribbble What are you working on? 
Instapaper Icon design