Vector Jungle – Free Vector Art, Vector Graphics and Backgrounds!

Illustrator Tutorials – Lots of great illustrator tutorials. Includes a free 30 days crash course.

Dreamstime – Get Daily Free Stock Photo Here!

Shutterstock – Download unlimited stock photos.

iStockphoto – Great royalty-free stock vectors for commercial projects. Get 10 free credits when you sign up.

Colorburned – Brushes, patterns, vectors, tutorials & more!