Box Office Mojo: Box office database; tracks box office revenue; widely used within the film industry as a source of data
Rotten Tomatoes: Discover the critical reaction to motion pictures via Rotten Tomatoes' unique scale: "the Tomatometer rating--based on the published opinions of hundreds of film and television critics--is a trusted measurement of movie and TV programming quality for millions of moviegoers. It represents the percentage of professional critic reviews that are positive for a given film."
Wisconsin Center for Film & Theater Research: One of the world's major archives of research materials relating to the entertainment industry; maintains over 300 collections from outstanding playrights, television and motion picture writers, producers, actors, designers, directors, and production companies
Media History Digital Library: A non-profit initiative dedicated to digitzing collections of classic media periodicals that belong in the public domain for full public access; online access to the histories of cinema, broadcasting, and sound.
Museum of the Moving Image: "Museum of the Moving Image advances the public understanding and appreciation of the art, history, technique, and technology of film, television, and digital media."
Internet Movie Database (IMDB): an online database of information related to films, television programs, and video games, including cast, production crew, fictional characters, biographies, plot summaries, trivia, and reviews.
Film Studies For Free Blog: A web-archive of examples of, links to, and comments on online, Open Access film and moving image studies resources of note. Maintained by a film studies professor at the University of Sussex.
Moving Image Genre List: All the types of subject access to moving image works, genre studies has emerged as the most frequently used and theoretically developed system.
AllMovie.com: Provides comprehensive movie info including reviews, ratings, and biographies.
American Film Institute - Catalog of Feature Films: The most authoritative filmographic database ont he web; includes entries on nearly 60,000 American feature-length films and 17,000 short films produced from 1893-2011