Ditto.com bills itself as a leading visual search engine. It’s a great alternate source for image searches. Human editors help with the selection and ranking process to ensure quality images and relevant search results, rather than relying entirely on text located on each page or within the filename of each image. The results are parsed regularly to weed out defunct images. The matches are good and rival those of traditional web search engines’ image search functions.

http://www.ditto.com