Hi there! Recently I found in google search engine that Wikipedia has got another search engine in results page How can I do it? algorithm? Thank
Google started showing additional search engine within search results to let users find exact pages that they are looking for within a website... For more info check this: http://googleblog.blogspot.com/2008/03/search-within-site-tale-of.html
even i was wondering on the same!! links inside the search result, and this happens only for wikipedia.. i think google loves wikipedia too much!!