Greg Storey have a post in his Airbag titled Designpedia, where he listed few design specific sites that he visit frequently, in addition to the links posted in comments it make a real designpedia in my opinion. Here is the full list of good links for designers :
Core77
Design Boom
Design Interact
Design Observer
Net Diver
A List Apart
CSS Vault
Bezembinder’s
Paperholic
Rojo Daily
Slanted
Fecal Face
WMMNA
News Page Designer
Visual Editors
Newsdesigner.com
SportsDesigner.com
CreativePro
Newstoday
Pixelsurgeon
Netdriver
Styleboost
Speakup
Linkup
We Work For Them
You Work For Them
Stylegala
CSS Beauty
Screen Spire
allmaple
design is kinky
shift
webcreme
techcrunch.com
