Free Clip Art for Teachers
http://www.phillipmartin.info/clipart/homepage.htm
Public Domain Photos & Clipart
The person or persons who have associated work with this document (the "Dedicator" or "Certifier") hereby either (a) certifies that, to the best of his knowledge, the work of authorship identified is in the public domain of the country from which the work is published, or (b) hereby dedicates whatever copyright the dedicators holds in the work of authorship identified below (the "Work") to the public domain. A certifier, moreover, dedicates any copyright interest he may have in the associated work, and for these purposes, is described as a "dedicator" below.
http://www.public-domain-photos.com/
Cool Archive
http://www.coolarchive.com/
#1clipart.com
http://www.1clipart.com/
PDClipart.org
PDClipart.org has made good faith efforts to find and include in our collection only images that we believe to be in the public domain. However, there is always the possibility, however small, that an image on this site is in fact not in the public domain and has been erroneously included in the collection, or that the image may not be in the public domain in your country or jurisdiction. Therefore, on our Terms of Use page, we provide links to the various sources of the images that were included on this site.
http://www.pdclipart.org/
DMOZ.org
DMOZ was founded in the spirit of the Open Source movement, and is the only major directory that is 100% free. There is not, nor will there ever be, a cost to submit a site to the directory, and/or to use the directory's data. Its data is made available for free to anyone who agrees to comply with our free use license.
http://www.dmoz.org/Computers/Graphics/Clip_Art/Public_Domain/
MyCuteGraphics.com
http://www.mycutegraphics.com/