[malandrew]

Dive in HTML5 by Mark Pilgrim

Designing w/ Web Standards, 3rd Edition by Jeff Zeldman - Please note that this book is more about orientation and how to go about learning HTML/CSS than actually coding. Only the last chapter contains a real coding exercise. Either way, it's worth a read.

Most of the best resources on HTML/CSS are the blogs and sites maintained by the main contributors to the standards. Whenever a section of the W3C spec is vague or confusing, go check out the blocks of people like Bruce Lawson, Eric Meyer and Zeldman to help clear up the ambiguities.