“This example demonstrates using CSS to graphically display standard playing cards on a web page … the method here uses the positioning features of CSS and a few standard HTML tags and character entities to create realistic looking cards with a minimum number of images and HTML tags.”
A nice display of CSS positioning. Be sure to check out the finished demo as well.
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