MediaBuilder has a great collection of icons, fonts, animated GIFs, as well as other resources and tools to support development of your Web page. They have a gif editor, a 3d text creator, and an animated banner creator.
Cool Archive has a lot of icons, animations, a button maker, a great logo maker, backgrounds, sounds, HTML tips, fonts, etc.
Iconolog has a great collection of icon gif files but it's hard to tell what is copyrighted.
Really Big has a bunch of links to Web Page material. Their icon and graphic list is commented so surfing can be a little more directed.
ClipArt Castle has free clipart, fonts, animated gifs, etc. but requires registration.
Image-O-Rama has free graphics including buttons, bars, bullets, animated GIFs, etc.
WebPlaces has a search engine that will find graphics for you.
Clipart.com has clip art and has some good links to art collections. They only show 5 graphics at a time, however, probably to artifically increase their hit rate.
GraphX Kingdom is hard to navigate but has a lot of graphics, expecially icons.
Funet Image Archive has a large collection of rather small pictures with a large fantasy collection. Funet Image Archive 2 is apparently an independent collection that is larger in both quality and size of picture but is very hard to browse.
Icon Browser has sheets of icons that are great for browsing.
The Amazing Picture Machine "...is a searchable index to graphical resources on the Internet. It is provided by the North Central Regional Technology in Education Consortium (part of NCREL, the regional lab), You can search for pictures of many kinds (see a partial list below) and also find some ideas for using the pictures in lesson plans."
Realm Graphics has a growing set of very nice graphics. Very good backgrounds section.
free-graphics.com is a good set of icons although it is difficult to browse.
The Free Graphics Store has free graphics and icons, strips, animated gifs, tools, fonts, etc.
Alta Vista's Picture Finder is actually pretty good at finding pictures on the Web given some keywords. However, it doesn't indicate if the picture is copyrighted.
Web Developer's Animations - nice set ordered alphabetically by letter so the navigation is not very good - you end up browsing one page of graphics for each letter in the alphabet.
GoGraph helps you search the Web for graphics. Also has links to graphics sites and some tutorials.
CoolText.com allows you to enter text and apply fonts, backgrounds, and color. You can even buttonize it. This cool site has some great free fonts and backgrounds as well
Kodak Picture Playground lets you upload one of your own pictures and play around with special effects via the Web. When you like the result, you can download it again.
Ditto is a search engine that finds pictures on the Internet. It is very useful and has a link to the owner.
Dr. Web's Graphics has a lot of information on using graphics in Web pages.
Colorlab lets you select from the 'color safe' palette and shows the colors that you select within each other so you can see how they'll look together.
I-US has some tutorial info. This is a general graphics community where you can submit your graphics creations for review. They also review Web sites if you want creative criticism of your work.
10 Tips on Graphics includes how to use Paint Shop Pro to create transparent GIF files, add texture to type in Paint Shop Pro, etc.
Dr. Ozone is a great graphical site and has some tutorials on creating effects with PhotoShop.
Bells N Whistles has info on creating web pages with a lot of stuff on using graphics and animations.