• library of congress flickr photos
  public domain images. high quality.
  in software, fonts, stock images with best-of-2008 photography photos stock by 3 users
• LIFE photo archive hosted by Google
  images from Life magazine
  in art and music with best-of-2008 history images photos stock by 8 users
• Creative stock images
  Buy & sell stock photos online
  in design & dev apps & util with photography photos stock by 5 users
• Flickr Related Tag Browser
  amazing way to browse ideas whether or not you need images...
  in online software & services with flickr photography photos stock by 32 users
• comstock
  professional Royalty-Free Stock Photography
  Stock Images - Royalty-Free Stock Photography Images and Photos at Jupiterimages.com.
  free images jupiterimages photography photos royalty stock
  in software, fonts, stock images with photography photos stock by 10 users
• Corbis
  photography
  in software, fonts, stock images with images photography photos stock by 24 users
• Flickr reverse lookup
  use filename to find photo. the photo id is the part before the uderscore. such as 2179080052 in 2179080052_1368ba909e_o.jpg
  in design & dev apps & util with flickr photos
• getty images
  
  celebrity getty gettyimages images news old photography photos sports stock
  in software, fonts, stock images with photos stock by 5 users
• photos on google maps
  Mapping Your Photos with Google Maps
  in design & dev apps & util with maps photos
• Picnik
  online photo editor. don't have photoshop? try this. pretty slick, simple, solid features. integration with flickr, photoshop, picasa,...
  in online software & services with editor photos photoshop by 79 users
• Understand a Histogram
  a photograph's histogram
  in design & dev apps & util with histogram photos by 3 users

photos from all users