All-Movie Guide - http://www.allmovie.com/
Listings of movies, included featured decade, new releases and weekly factoids. Also offers reviews, biographies, ratings, images, titles, credits, and thousands of descriptive categories.
American Film Institute - http://www.afi.com
The American Film Institute as an independent, non-profit organization dedicated to preserving the heritage of film and television, identifying and training new talent, increasing recognition and understanding of the moving image as an art form.
Internet Movie Database - http://www.imdb.com/
A catalog of all sorts of information on over 200,000 movie & TV titles plus even more on over 400,000 actors and actresses, nearly 40,000 directors and hundreds of thousands of other people who work in the industry.