ImgRed is a free online image hosting service that allows indirect hotlinking wherein users can embed, redirect or link to images from someone else’s website.
To avoid hot-linking an image, prepend http://imgred.com/ before the URL. To show a thumbnail of the image, prepend http://imgred.com/tn/ before the URL.
While you increase traffic to ImgRed, you can avoid hotlinking images and eating up the original host’s bandwidth. Cool.

Adobe Systems’ Advanced Technology lab has developed two tools for image authentication. Clone Tool Detector, which determines whether a section in a picture, has been recopied from another part of the picture. It is difficult to predict if two images are cloned, but this tool will say if they are “improbably similar”.