Vector Portal : free vector graphics
Vector Portal has hundreds of free vector graphics in .eps, .ai, and .svg formats. These aren't lame, cheesy graphics, either. The site is full of things designers and vector artists really need.
Vector Portal is easy to navigate, with the categories clearly marked. There is also a search feature, and vector artists can submit their work for download.
You can see more at http://www.vectorportal.com/