Alta Vista Image Search

http://www.altavista.com/cgi-bin/query?pg=q&stype=simage

Search the web for images.

Microsoft Design Gallery Live
http://dgl.microsoft.com/

Find images, animations, and sounds that add zip to your work.

Ditto.com

http://www.ditto.com/

The leading visual search engine

Pics4Learning

http://pics.tech4learning.com/

Discovery School's Clip Art Gallery
http://school.discovery.com/clipart/index.html
Discovery School now makes it easy to add graphics to your next project, whether it's for home or school. Choose from hundreds of original clip art pieces, including animations!