====== Commercial ======

  * Alamy http://www.alamy.com/
  * Corbis http://pro.corbis.com/
  * Getty Images http://www.gettyimages.com/
  * Jupiter Images http://www.jupiterimages.com/
  * Dreamstime http://www.dreamstime.com/
  * iStockPhoto http://www.istockphoto.com/
  * Inmagine http://www.inmagine.com/
  * ShutterStock http://www.shutterstock.com/
  * Fotolia http://www.fotolia.com/
  * Photos.com http://www.photos.com/en/
  * FirstLight http://www.firstlight.com/
  * FotoSearch http://www.fotosearch.com/
  * BigStockPhoto http://www.bigstockphoto.com/
  * ShutterPoint http://www.shutterpoint.com/
  * FotoLibra http://www.fotolibra.com/
  * CutCaster http://www.cutcaster.com/
  * StockXpert http://www.stockxpert.com/

====== Free ======

  * Massive list http://commons.wikimedia.org/wiki/Commons:Free_media_resources/Photography
    * Another list http://www.powstock.com/
  * Flickr Commons http://www.flickr.com/commons/
  * sxc.hu http://www.sxc.hu/
  * StockVault http://www.stockvault.net/
  * Dreamstime http://www.dreamstime.com/
  * Everystockphoto http://www.everystockphoto.com/

====== Clip Art ======

  * OpenClipArt http://www.openclipart.org/