There is a wealth of valuable resources on the net - it's all a matter of being able to find them. This is a categorized collection of web design resources I've found useful. Ten random entries appear below.

Whitespace
Discussing web design without fear of learning something new
CSS/edge
Eric Meyer's fabulous CSS work - one of my favorite CSS sites.
PHP Language Reference
Straight from the source: php.net
Pixel Fonts
Teeny tiny bitmap pixel fonts for web designers with little screen real estate
DevGuru Javascript Reference
A good quick-reference guide for functions, operators, constants, objects, and more.
Web Standards Awards
Web Standards Awards showcases the design of sites that adhere to web standards.
What Do I Know?
Todd Dominey's Design Blog
456 Berea Street
Roger Johansson from Sweeden talks about web design.
JavaScript-Reference.info
A free online quick reference, complete with listings of browser-specific bugs
Color Combos by WebDevelopersNotes
More than a dozen pages of example color combos.