Web design
CSS
FortyEight Designs - Great example of CSS featuring the most beautiful contact form.
CSS PLaY - Looks at the more advanced application of CSS, and a good place to find inspiration.
Glish.com - Unravel the mystery of CSS layouts.
List-o-matic - Automatic... but elegant :)
http://www.codebeautifier.com/
CSS Layouts
Tinderbox
Design tools
http://vectormagic.stanford.edu/
Colour Tools
Colour Lovers - Some great pallettes
Showcase sites
http://zeniltuo.com/ - Showcase listing, fantastic. http://www.cssdrive.com/
Layouts
Lists
Navigation
http://www.alvit.de/css-showcase/
http://www.cssbeauty.com/gallery/
http://www.cssshowcase.co.uk/
http://www.13styles.com/ - CSS navigation examples with code.
http://www.cssplay.co.uk - A LOT of great css stuff, not just navigation.