Graphics/Clip Art

http://www.clipart.com
http://www.animationcentral.com - Huge collection of animated gifs
http://www.animationcity.net/animcity.htm - It has a collection of 38 animated gifs
http://www.gifart.com - Optimizer, Graphic editor and 1000 images
http://www.abcgiant.com - A good collection of Graphics, There are sections for Backgrounds, Buttons, Arrows, Banners, Balls and Bar lines.