Graphic / Web Design
2is3 (Amber Denny)
A List Apart (Web design)
Any Browser (Cross-browser Web design)
Communication Arts
Design Is Kinky
Digital Web Magazine (Web design)
Brian Ewing (Posters)
Eye
Glen E. Friedman (Photography)
Jeff Gaither
Gigposters.com
Glish.com
Guerrilla Art Nation
Derek Hess
Obey / Giant (Shepard Fairey)
Mark Ryden
Seempieces (Trav Smith)
Jeff Sheinkopf
Ralph Steadman (Illustration)
Stealworks (John Yates)
Undesign (Tibor Kalman, design ethics and principles)
useit.com (Jakob Nielsen / usability, Web design)
Web Standards Project (Web standards information)
Westciv (Web design)
W3C (World Wide Web Consortium)
Yolamda (Photography)
Zype (Josh Campbell's excellent Web resource)