XHTML Template Start all of your web pages by downloading and then editing this file (right click the link, and save the link to a file on your computer).
Backgrounds I've put a few background resources online.
Master CSS, Part 1: A site with a few tutorials / examples of slightly more advanced CSS usage.
Notepad++ (a great HTML/CSS editor, Windows only) - don't use Notepad/Wordpad unless you're a masochist. jEdit seems to be a good alternative to Notepad++ (and, being written in Java, should run on any computer).
How to Avoid Deprecated HTML: If you were taught HTML a few years ago, you are probably used to using things like <b>, <i>, and <center>. This page shows how to do those things, properly, in CSS.
CSS & XHTML References and Links: Some great links covering XHTML/CSS validators, references, standards, tips, color pickers, examples, and more.1)
css Zen Garden: Some beautiful examples of using CSS to completely change the look and layout of a webpage, without changing the HTML.
BrowserShots.org: Test how your web page looks in 50+ different browsers.