Google Sites is a free service that allows you to easily create websites and gives you a place to put them online.  Since it is web-based, it works on any computer platform, and it does not require you to purchase or download any software.  Consider this as an alternative to Dreamweaver or iWeb.

Safari Tech Books Online (PennKey required for access) offers several books on web design topics such as HTML, CSS, Javascript, as well as at least one Dreamweaver-specific book, "Dreamweaver CS3 The Missing Manual"

The online Dreamweaver help from Adobe.

Free Dreamweaver tutorials from the excellent and highly-recommended Layers Magazine.  Some are meant to be read, others are videos meant to be watched.

Adobe support forums for Dreamweaver.  Great place to ask questions and learn more about the software.

An interactive page that allows you to type some HTML and immediately see how it will appear on a webpage.  Good for testing and experimenting with HTML.

A handy, dandy reference chart for using colors in HTML.  Shows the color and the matching hexadecimal HTML color code (and name, where applicable)

The CSS Zen Garden is a showcase of web designs and a good example of the incredible power that CSS affords a web designer, independent of HTML.

The basics of HTML tags and how they work.

Free 30-day trials of most Adobe software, including Photoshop, Dreamweaver, and Illustrator.  Great to try a piece of software before commiting to buying it, and great if you're working on a project and don't need more than 30 days to complete it.

W3 Schools offers free tutorials on HTML, XHTML, CSS, and more.  Highly recommended for new learners of HTML, and as a handy reference for more experienced users.

this would be nice. but i can't install things so ... whatever.

thin on documentation

Robust XSS handling on several fronts.

Also nicely documented, recent-ish, some good thoughts.

Nicely documented, recent-ish. Still not all I want but it's got nice structure.

As the title implies, this is a page with advice on how to post mathematical expressions to the Web. It gives some guidelines for very basic expressions and links to pages for more complicated content.

This site came into existence as a collection of webmaster tools developed to help myself and a few other webmasters with our daily webmaster chores. After creating a fair number of online tools, it was decided that we should make the site public, so that other webmasters around the world would have access to them for free. The suite of free tools and resources offered continues to grow to this day, and we aim to offer something useful for the beginner to the advanced webmaster alike.

Definitive explaination of what's supposed to work in HTML forms.  I find these kind of sites to help in my current avocation...