free stock photos:

• everystockphoto search engine (searches many sources like Flickr, morgueFile, freeragestock, stock.xchng, fotolia, etc.):
  http://www.everystockphoto.com/
• free stock photos directory
  http://pstutorialsblog.com/44/free-stock-photos/
• morgueFile
  http://www.morguefile.com/
• Stock Xchng
  http://www.sxc.hu/
• FreeStockPhotos.com
  http://freestockphotos.com/
• FreePhotosBank
  http://www.freephotosbank.com/
• FreeFoto.com
  http://www.freephotosbank.com/
• Free Images
  http://www.freeimages.co.uk/
• BigFoto.com
  http://www.bigfoto.com/
• freerange stock
  http://www.freerangestock.com/
• stock photos that don't suck
  https://medium.com/p/62ae4bcbe01b

clipart, photos, sounds, animations:

• Microsoft Design Gallery Live
  http://dgl.microsoft.com/
• Tripod Image Gallery
  http://build.tripod.lycos.com/imagebrowser/
• WPClipart
  http://www.wpclipart.com/browse.html
• New York Public Library Digital Gallery
  http://digitalgallery.nypl.org/nypldigital/
• Graphics by Dezign
  http://www.graphicsbydezign.com/
• bellnwhistles.com - animated graphics and other web page resources
  http://www.bellsnwhistles.com/
• The Gifpile - http://members.home.net/billca/main.html
• Yahoo search for Clipart
  http://search.yahoo.com/bin/search?p=clipart
• FindSounds.com
  http://www.findsounds.com/types.html
• Laura Turner's Clipart/Backgrounds/Sounds links:
  http://www.bhsu.edu/education/edfaculty/lturner/clipart_background_sounds.htm

graphics tutorials:

• Bitmap and Vector Graphics Explained
  http://freerangestock.com/understanding/vector_bitmap/