In search of the deep Web

"Those of us who place our faith in the Googlebot may be surprised to learn that the big search engines crawl less than 1 percent of the known Web. Beneath the surface layer of company sites, blogs and porn lies another, hidden Web. The 'deep Web' is the great lode of databases, flight schedules, library catalogs, classified ads, patent filings, genetic research data and another 90-odd terabytes of data that never find their way onto a typical search results page."