A List Apart, from Jeffrey Zeldman, web design columns by various contributors
CSS articles and tutorials on the A List Apart website
Jeffrey Zeldman Presents The Daily Report, web design, personal
Design Inspiration at Authentic Boredom
Good Designers Copy, Great Designers Steal at Sitepoint [Design Principles]
Giving Full Typographic Control to the User by Mike Davidson
Liquid v. Fixed by Design by Fire
Mastery, Mystery, and Misery: The Ideologies of Web Design (Jakob Nielsen's Alertbox)
The new typographyclagnut/blog
Tackling Usability Gotchas in Large-scale Site Redesignsat A List Apart
Using Background-Image to Replace Text from Stopdesign - see the links in "Important Notes" for better ways to do image replacement and keep it accessible to screen readers
Web Design Practices helping designers understand what design practices are currently in use on the Web and aims to gather research about the usability of commonly-employed design practices.
Web development mistakes from| 456 Berea Street, aka What Not To Do On Your Website
Web development mistakes, redux from| 456 Berea Street, the rest of What Not To Do On Your Website