Learning
W3Schools
The world's largest web developer site, apparently. Great for beginners.
Stack Overflow
Q&A website for coding, programming, and the such. Very useful if you need help with making something work and are looking for answers.
Web Accessibility
What I've Learned About Web Accessibility as a Dyslexic, Sighted, Mouse User
What it says on the tin. Lots of good tips on making your site more accessible and convenient in general.
Three Common Accessibility Problems and How to Fix Them
What it says on the tin. Lots of good tips on making your site more accessible and convenient in general, and is shorter than the one above it.
Code Snippets
RV's free Javascript/DHTML effects
What it says on the tin.
Layouts
ThemeKings Graphic Design
Cool old school web templates and resources for you to use. You need to pay for some.