Webkimia - Web Developer's Handbook
CSS resources
Dynamic Drive CSS Library
CSSPlay, Stu Nicholls. Experiments with CSS
W3 Schools. CSS tutorial
RoundedCornr. Generate HTML/CSS code and images for rounded corners
W3C CSS validator
CSS templates
Open Source Web Design
Solucija CSS Templates
Nuvio Templates
Free CSS templates
CSS Zen Garden
CSS showcases
CSSWebsite
CSSMania
CSS Beauty
Web Creme
CSS Reboot
Best Web Gallery
HTML
Latin-1 Character Entities Reference
W3C HTML validator
SEO
The Web Robots Pages
Daily reading
Smashing Magazine
A List Apart
Digital Web Magazine
Other Resources
21 Cheat Sheets: RoR, Gimp, Photoshop, MySQL, PHP...
Web Design
99 Resources for Web 2.0 Design
Yahoo! Design Pattern Library
Web 2.0 how-to design style guide
Colour
Colour Lovers
AJAX
60 More AJAX- and Javascript Solutions For Professional Coding
Starbox. Rating stars for prototype
dhtmlgoodies.com - A library of DHTML and Ajax scripts
Ajax loading gif generator
Lightbox 2
Fonts
Font River
Urban Fonts
Dafont
40+ Excellent Freefonts For Professional Design
The Best 100 Fonts
Free Images
DeviantART
GettyImages