“The 0xdb is a rather unique kind of movie database. It uses a variety of publicly accessible resources, like search engines and file-sharing networks, to automatically collect information about, and actual images and sounds from, a rapidly growing number of movies. What the 0xdb provides is, essentially, full text search within movies, and instant previews of search results.”
The part of the quote which should call for your attention is “full text search within movies”. If you type in a sentence, the database shows you every movie where this sentence appears and even the particular scene!
Further amazing features are an visualition tool for every film and a connection to google maps, which show you locations, where the movie was shot.
Read a detailed review at Know Future.