Behance – Online portfolios for creatives
Core77 – Industrial design focused site, but useful information for all designers.
Design Boom – source for architecture, design & art news
Design Directory – Directory from Core77 in cooperation with Bloomberg Businessweek
Design Instruct – web magazine for designers and digital artists where you can find and learn design tips and tricks. Good freebies section.
Design Observer – Design, culture, change blog resource, large variety of art and design.
Harvard Design Magazine – published twice yearly from the Harvard University Graduate School of Design.
Industrial Design Served – Curated work from leading creatives on Behance
Infosthetics – Information æsthetics focused blog by Andrew Vande Moere
Interaction Design Umeå – blog about IxD projects and labs
37 Signals: Signal vs. Noise blog posts related to Design
LukeW – Blog from an active digital designer and interaction designer
MocoLoco – Modern Contemporary Design
Six Revisions – Design and web developer focused, but nice tips all.
This Colossal – Art and Design blog site covering a wide range of current work
UXMag – User Experience Magazine
UX Storytellers – stories from UX practitioners and researchers.