TinEye Reverse Image Search

I have not tried a search with TinEye, "a reverse image search engine. It finds out where an image came from, how it is being used, if modified versions of the image exist, or if there is a higher resolution version. TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks. It is free to use for non-commercial searching. TinEye regularly crawls the web for new images, and we also accept contributions of complete online image collections. To date, TinEye has indexed 1,630,532,499 images from the web to help you find what you're looking for." (http://www.tineye.com/about)