Websites

Source: What are the most influential design blogs? - Quora

* are additions to quora list

High Brow:

UI/Web:

General:

Product:

Branding:

Book Cover Design:

Design Portals (these provide a good sense of the design currents)

Web Personalities (these folks still set the trend for others to follow)

General

Behance Network: http://www.behance.net/
Co.Design (Fast Company): http://www.fastcodesign.com/
Co.Exist (Fast Company): http://www.fastcoexist.com/
Creative Review: http://www.creativereview.co.uk/cr-blog
Core77: http://www.core77.com/
Design Assembly: http://www.designassembly.org/
Designboom: http://www.designboom.com/eng/
Design Mind (Frog Design): http://designmind.frogdesign.com/blog
Étapes (French): http://www.etapes.com/
Fubiz: http://www.fubiz.net/
Good: http://www.good.is/category/art-and-design
swissmiss: http://www.swiss-miss.com/
WANKEN: http://blog.wanken.com/

UI/UX/Web

A List Apart: http://www.alistapart.com/articles/
Aza Raskin: http://www.azarask.in/blog/
Creative Applications: http://www.creativeapplications.net/
iA: http://www.informationarchitects.jp/en/articles/
Johnny Holland: http://johnnyholland.org/
LukeW: http://www.lukew.com/ff/
Pttrns: http://pttrns.com/
siteInspire: http://siteinspire.com/
Six Revisions: http://sixrevisions.com/
Small Surfaces: http://smallsurfaces.com/
Spyline: http://spyline.de/
Styleboost: http://styleboost.com/
TheFWA: http://www.thefwa.com/
UX Booth: http://www.uxbooth.com/

Graphic Design & Identity

AisleOne: http://www.aisleone.net/
Brand New: http://www.underconsideration.com/brandnew/
Branding Served: http://www.brandingserved.com/
grain edit: http://grainedit.com/
Identity Designed: http://identitydesigned.com/
ISO50: http://blog.iso50.com/
Lovely Package: http://lovelypackage.com/
Lovely Stationery: http://lovelystationery.com/
SeptemberIndustry: http://www.septemberindustry.co.uk/
Swiss Legacy: http://swisslegacy.com/
UPPERCASE: http://www.uppercasegallery.ca/
Visuelle: http://visuelle.co.uk/

Data Visualization

datavisualization.ch: http://datavisualization.ch/
FlowingData: http://flowingdata.com/
Information Aesthetics: http://infosthetics.com/
Information is Beautiful: http://www.informationisbeautiful.net/
Nicholas Feltron: http://feltron.tumblr.com/
Visual Complexity: http://www.visualcomplexity.com/vc/

Typography

I Love Typography: http://ilovetypography.com/
The Font Feed: http://fontfeed.com/
Typography Served: http://www.typographyserved.com/
Typographica: http://typographica.org/
Typojungle: http://typojungle.net/slanted-16-slanted-redesign/
Fonts in Use*: http://fontsinuse.com/

Print

Product

Design Ephemera

Typography

Data Visualization