An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.
http://www.inkscape.org/index.php?lang=en
Edit images, create effects, design logos, find colors, collaborate, and more. All you need is a web browser. Easy to use and free.
http://aviary.com/home
Use Raven to create fully scalable vector art appropriate for logos or tee shirt designs. You won't find a similar tool on the web.
http://aviary.com/tools/raven
A range of clipart which provided free for educational use by 2Simple. Categories include: geography, history, maths, P.E., R.E. and science
http://www.2simpleclipart.com
TVARK is the on-line TV museum. The site is intended as a tribute to the work of television presentation and graphics, and to preserve a slice of our social history.
http://tv-ark.org.uk
Vecteezy is an index of Free Vector Graphics available for download by some of the best artists around the world. The site is updated every day, so be sure to check back often.
http://www.vecteezy.com
Free Clipart, Images, and Graphics.
http://www.artvex.com