While there are many excellent authors with books and blogs about web design and coding, Dan Cederholm is one of the very few that consistently provide clear and understandable instruction on the how and why of web design craftsmanship. As a web coding technician, I use his first book, "Web Standards Solutions", often to educate other coders on the proper way to use and code tables in HTML and CSS - it is simply the best.
His latest published effort, "Handcrafted CSS, More Bulletproof Web Design", is another sterling example of his skills in explaining how to code web pages using best practices in CSS and semantic, standards-based design and coding techniques. What sets this volume apart is the DVD that comes bundled with it, where you get a personal tutorial on 10 essential Bulletproof CSS guidelines, tips and techniques. Just watching this I learned a couple of techniques that I didn't know already and will apply immediately at my job.
And the book of course, is another well written, clearly illustrated volume that steps you through the process and reasoning behind crafting well written and semantic CSS for accessible and usable web design.
This book is definitely a must have for web designers and coders from novice to professional!