What web programming texts would you recommend?

I am always looking to expand my library of books and am really lacking in the web design/coding department. I currently have two of the “Visual Quickstart” books and those have been pretty helpful so far, but I feel I need to learn more. Some of the coding languages I would like to learn more about are (X)HTML, DHTML, CSS, PHP, Javascript, and AJAX. My goal is to be as well-rounded in my coding knowledge as possible. I know it’s not possible to know everything, but I would like to have a working knowledge of these things.

Feel free to suggest any other languages, products, or features that you think would be good for a budding web designer to look into.

Thanks in advance!