By far the best source of images today are the many royalty free image
exchanges. They are not free but usually charge a yearly fee or a
low ($1.50 to $3.00) fee per image download.
ACDSee 8 Photo Manager — See what a difference a good manager makes ACD delivers the leading platforms for image management and technical illustration, giving consumers and professionals everything they need to manage, create, edit, share, and publish content for print, presentation and the Web faster