TinEye is the first image search engine on the web to use image identification technology. Given an image to search for, TinEye tells you where and how that image appears all over the web—even if it has been modified.
This is a very cool, specialized search engine that can really help find out if someone is stealing your images. Its kinda of like copyscape but for images. TinEye is what I used to find out that a blogger had stolen one of my blog posts and had hot-linked the images from my server.
Check it out, it’s worth the time…
Firefox plugin (this is what I run):