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.