This site has lots of great stuff. It has over 500,000 high-quality web animations, animated gifs, backgrounds, templates, graphics and sounds available for imediate download. They add hundreds of animations and graphics every week. Sign up for their free newsletter and they'll email you a free animation every week. (You can cancel at any time).
The Graphics Factory has hundreds of black and white clipart images and line drawings. They've got lots of subjects - business, faces, holidays, music, food & drink, transportation and lots more.
eBay is a great place to find very inexpensive clipart. There are usually great bargains, often you can buy several thousand images for just a couple bucks. Then you've got your very own clipart library for future projects. Be sure to read the terms of each auction, some sellers will let you download your black and white clipart as soon as you pay, others will mail your black & white clipart on a CD
A collection of free black and white clipart of books from Littera Scripta.
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 or on Web sites
Black and white pen and ink drawings.
Facsimile black and white reproductions from Arbeau reprinted in the Dover edition of Arbeau.
Public domain line drawings of wildlife use these drawings in newsletters, web pages, and reports. No approval from the Service is required before the usage these drawings.
Railroad clip art including rolling stock, diesels, railroad signs, and steam engines. All images are in GIF or JPG format.