The following list of websites provides game development resources such as game graphics, sound effects, music libraries, and other media.
Reiner's Tilesets: Royalty-free tiles and animated sprites http://www.reinerstileset.de
Free Character Animation Graphics http://www.vbexplorer.com/charpack1.asp
Free Sound & Music Clips http://www.vbexplorer.com/gamesound.asp
Edgar Ibarra's Pocket Ideas (3D artwork) http://www.pocketideas.com