With CoolVectors, you can submit your own vectors for critique, browse through others' submissions, and download the ones you like.
Vecteezy is a community driven site where members can share free vector art and other vector resources. As for the license, I will quote this line from Vecteezy "All the graphics are free to download and, depending on the license, free to use in your projects."
Vector Portal hosts free vectors, royalty free vector images, and Adobe Illustrator templates. It has been around for four years, and that is one of the reasons they have such a huge database of free vectors. You can even submit your own vectors to this site.
This site is a free vector graphics resources dealing with various types of vector files like Adobe Illustrator AI, EPS, PDF, SVG, and Corel Draw CDR. You can also submit your own vectors.
At keepdesigning.com you can find useful tutorials and graphics resources like brushes, fonts, and vector art.
Vector Junky is another site hosting free vector resources that you can download and use. (License varies.)
A web design blog that offers free resources like templates, tools, and vector graphics. It also features tutorials on various topics.
blog.spoongraphics is a popular design blog that mainly features design tutorials. However, they also have quite a good amount of free resources (including vector graphics) for designers.
VectorArt is an online resource of free and premium vectors and tutorials. This site also lets you submit your own vector art and sell them as premium vectors.
Dezignus is a community of graphic designers where you can find various free graphics resources like vectors, brushes, textures, and backgrounds. If you are interested, you can also submit your own freebie.
DragonArtz is a great resource of free vectors that are licensed only for personal use.