One of the most popular ways to use the web is to simply search for images. People love to search for images online, and there are many sites and search engines dedicated just to chasing down all sorts of images.
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TinEye has all sorts of interesting possibilities. While it doesn't offer all the shopping center features of Yahoo or the human curation of Mahalo, Google is fast, relevant and the largest single catalogue of web pages available. What We Don't Like Result screen entries aren't dated.
WHY SHOULD YOU CARE?
Give DuckDuckGo. Content-based image retrieval is the science if finding images by the actual content of an image, such as the colours or what objects are shown in the image. Yippy is a Deep Web engine that searches other search engines for you.