Creative Nerds supplies lots of good design related articles. The also offer free photoshop tutorials and free illustrator tutorials.  Checkout their freebie section thats packed full of goodies including some compiled lists of where to get even more.

Illustratortips.com: Adobe Illustrator Instruction, Information & Inspiration. offers a varity of tutorials and articles for people that have an interest in vectors.

TUTfactory gathers all the best tutorials for various design programs in one place so you can find them, view them and rate them…

Illustrationclass.com is brought to you by designer/teacher Von Glitschka. He provides some of the best illustration and Adobe illustrator tutorials.
Von teaches digital illustration at a local college–by popular demand, he’s created www.illustrationclass.com, a resource site for students and professional alike. Von is married to Rebecca, and they have two creative daughters, Savannah and Alyssa, who [...]

N.Design Studio is the design blog and portfolio of Nick La, Toronto based illustrator and web designer. N.Design Studio offers some nice Illustrator tutorials as well as vectors and icons.

Jay Hilgert presents BittBox, an extraordinary design blog that covers just about everything you could need. I particulary love the hi-def brushes and tutorials that will help you perform better and give you better knowledge of your design tools. BittBox offers lots of freebies and goodies.