1. Animation Factory
Thousands of free 3D animated gifs, clipart and graphics. Flags, buttons, dividers, icons, bullets, and more.
www.animationfactory.com

2. Clipart.com
Offers subscription based access to a wide selection of graphics.
www.clipart.com

3. Discovery School's Clip Art Gallery
Discover a large quantity of black and white clip art educational clipart for students, parents and teachers. Permission is granted to download no more than ten different clip art images for non-revenue-producing use on hard copy documents ...
school.discovery.com/clipart

4. Classroom Clipart
Provides educational clipart to be used on projects and reports. Clipart categories include countries, dinosaurs, animals, space, and weather.
www.classroomclipart.com

5. StockXchng
Collection of free stock images, collected and uploaded by the users.
www.sxc.hu