TinEye
Uses a complex algorithm and digital fingerprinting technology to ID images even if they don't have the same name. So, you could upload a picture of Mandingo or Asia Carrera, not knowing who they were, and it would give results for where that picture appears in other places on the web, and even give you a name of who's in the image!
Right now it's in beta, so enjoy the video!
New Search Engine - ID's Pornstars Automatically 
