The author of http://www.creativeopera.com/2009/80-design-blogs/ are listing the best blog out there that can giving inspirational, creativity and ideas.
She categorized each of the blogs into one of ten main categories: All-in-One, Inspiration, Tutorials, Web Development/Code, Freelance, Logos & Typography, Advice & Discussion, Freebies & Giveaways, Blogging, and Micro-Blogs/Links. That does not mean that the blog doesn’t offer anything else. It just means that the blog has a main focus. Creative Opera, for example, really focuses on giving advice to new designers or design students. But, we offer many other things as well — and have plans to expand greatly in the upcoming months. I’m not trying to pigeonhole anyone, The author just want to make it easier for you to find what you are looking for. Hopefully you’ll be able to find a few blogs here that will be helpful to you in your design career.