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Keywords offer free, top 500 searched internet keywords compiled from a database of over 330 million search terms extracted from popular metacrawlers, including Metacrawler and Dogpile search. There are 2 keyword lists; the last 48 hours, and the last 90 days, both updated daily. Keywords are essential for search engine marketing and pay per click advertising in Google AdWords, Yahoo Search Marketing!, MSN adCenter, and Ask Jeeves Sponsored Listings.