Cannes International Film Festival - site features the 50 year history of "cinema's prestigious competition" -- a decade-by-decade look at the event in the context of what was happening in the world at the time.
CineMedia - "the Internet's Largest Film and Media Directory now with over 25,000 links"
CrankyCritic - Film students can tell you what is good for you. Cranky tells you what is good to sit through. He also tells you enough about himself that you'll be able to tell if your taste and his are compatible.
Greatest Films, The - a unique website containing plot summaries
(with actual film dialogue), review commentary with emphasis on story
content and historical background, and hundreds of colorful, vintage
film posters for some of the best Hollywood and American classic films
in the last century.
Internet Archive: Movie Collection - This collection contains movies that the Prelinger Archives has digitized (about 956 now online) and donated to the Internet Archive. The films focus mainly on everyday life, culture, industry, and institutions in North America in the 20th century.