Web Design

The Counter keeps current stats on what screen resolutions, operating systems, and browsers people are using to explore the web. Look to the right for navigation-it's a bit hard to see.
http://www.thecounter.com/stats/2003/November/res.php

Web page Design for Designers has good advice for web designers.
http://www.wpdfd.com/

The Web Style Guide helps in creating an overall website style.
http://www.webstyleguide.com/

An online course on gestalt theory and design
http://daphne.palomar.edu/design/gestalt.html#anchor1123302

Brand Positioning

Lexicon and Zyman are two companies that specialize in branding. Their sites give some insight into how the process works.
http://www.lexiconbranding.com/process2aSound.html
http://www.zyman.com/home.asp

Accessibility

Bobby is a utility for testing website accessiblity to disabled users.
http://www.cast.org/bobby

The W3C accessiblity guidelines are a little dry, but specific.
http://www.w3.org/TR/WAI-WEBCONTENT/

Usability Resources

Jakob Neilsen's site includes excellent advice and is a good example itself of how to write for the web.
http://www.useit.com

Usable Web is a little out-of-date but still contains one of the best collections of links on usability.
http://www.usableweb.com

Usability Professionals' Organization
http://www.upassoc.org

University of Maryland's Usability Resource List contains links to papers describing usability methodologies and tools.
http://www.otal.umd.edu/guse/testing.html

Usability Testing of World Wide Web Sites is a paper on website usability research from the Bureau of Labor Statistics
http://www.bls.gov/ore/htm_papers/st960150.htm

Web Authoring Tools

Dreamweaver Depot is a collection of free add-ons for Dreamweaver.
http://www.andrewwooldridge.com/dreamweaver/

DrHTML checks webpages for spelling, formatting, and other errors.
http://www2.imagiware.com/RxHTML

Webmonkey is a great resource for learning how to create web pages. It's written in a very easygoing style.
http://hotwired.lycos.com/webmonkey/