Been looking for free clip art graphics but finding lots of ad sites or sites that you are required to pay to use?  Here are some that I have browsed through that actually have free clip art on them.

Edit: The first link should not be missed, 5,978 HIGH quality jpg graphics!

http://nerdbusiness.com/blog/5978-high-quality-icons-web-apps-rss

http://www.openclipart.org
http://www.bizart.com
http://www.free-clip-art.com
http://del.icio.us/search/?all=icon
http://mormegil.wincustomize.com

http://www.prodraw.net
http://www.theclipartsite.com

http://school.discovery.com/clipart/
http://hotfreegraphics.com

http://www.allfreeclipart.com - Limited Selection

http://classroomclipart.com - More photos than clipart

http://www.magicwondertags.com/freeclipart.htm - Limited Selection

http://www.vector-clipart.com - A few Vector graphics

http://www.barrysclipart.com

http://www.1clipart.com
http://www.ace-clipart.com

Personal Use Only:

http://www.clipartheaven.com
http://www.designedtoat.com
http://www.cooptoons.com
http://www.yellowicon.com
http://www.webstarwest.com/Standard/clipart.html
http://www.magicwondertags.com/freeclipart.htm - Limited Selection
http://www.interfacelift.com

For MS Office users:

http://office.microsoft.com/clipart/

Specialized:

http://www.equizotic.com/free.html - Horses
http://www.realestateclipart.com - Real Estate Clipart
http://www.famfamfam.com/lab/icons/ - Free Icons
http://tango.freedesktop.org - Free Icons
http://www.glyfx.com - Icons, free & commercial

http://www.kde-look.org - Skins, Icons, Wallpapers - GPL

For Educational use only:

http://www.shsu.edu/~lis_mah/documents/clipartportal.html

Looking for Icons, here is a review site listing many icon resources and reveiws of them:

http://www.iconsreview.com

You might also check out the Icon Collection list at:

http://hintsandtips.com/ShowPost/325/hat.aspx