There’s a new book coming out that looks promising–HTML Mastery: Semantics, Standards and Styling by Paul Haine. It’s due to release in the next month or so. The book describes in detail how to use semantic XHTML for a usable and accessible web site.
Not a new concept (dare I say trendy?) but very valid and relevant as this is what we should all be developing for. The web site for the book states:
it’s aimed at web designers and developers who have already mastered the basics of HTML and web design, but want to take their markup further, making it leaner and more semantically rich, for a more efficient, more usable/accessible web site