Similar Images now becomes the first major feature in Google Labs that has taken the big leap into becoming a permanent feature of Google Search. Interestingly, Google has to make this move right after Gazoopa, a similar images search engine come out in beta. Although Gazoopa has far more better features than Google Similar Images feature, it’s still is a competition that Gazoopa has to contend with.
http://www.searchenginejournal.com/similar-images-search-feature-graduates-from-google-labs/14267/