IMDb Movies Watchable Online

Below are movies that appear on certain IMDb charts and that can be found on-line in one form or another:

Netflix: Movies that are watchable directly on the Netflix website (requires a paid monthly subscription to Netflix and recent versions of Microsoft Windows and Internet Explorer).
Hulu: A free website backed by NBC Universal, News Corp., and their deep pockets. Offers full-length and excerpted movies and TV shows (requires a browser with JavaScript and Flash support; expect commercial interruptions). Note: All Hulu links here are for full-length movies.
Internet Archive: Movies here are free in both senses: not only can they be viewed on-line, they can also be downloaded and copied for any use whatsoever (compatible with most common browsers and video players).
iTunes Store: Movies that can be downloaded and viewed via Apple's iTunes (requires payment for rental or purchase, as well as iTunes software or compatible Apple hardware).
LikeTelevision: As the name implies, movies are streamed for free but interrupted with commercials (requires a browser that handles Adobe Flash); downloads are also available on a purchase or subscription basis
Public Domain Torrents: Public-domain movies that can be downloaded via a BitTorrent client in a variety of formats; most are also viewable via an embedded Google Video player (requires a browser that handles Adobe Flash)

Movies from IMDb's Top 250

Movie	Netflix	Hulu	Internet Archive	iTunes Store	LikeTelevision	Public Domain Torrents
Aguirre: The Wrath of God *
All Quiet on the Western Front
Amadeus
Barry Lyndon
The Battle of Algiers
Ben-Hur
The Big Lebowski
Bonnie and Clyde
Bride of Frankenstein
The Bridge on the River Kwai
The Cabinet of Dr. Caligari
Casablanca
Chinatown
A Clockwork Orange
Cool Hand Luke
Crash
Das Boot
The Day the Earth Stood Still
Diabolique
Dial M for Murder
Die Hard
Doctor Zhivago *
The Exorcist
Finding Nemo
Frankenstein
The General
Glory
The Gold Rush
The Grapes of Wrath
The Great Escape
Harvey
High Noon
His Girl Friday
The Incredibles
It Happened One Night
The Killing
The Lady Vanishes
Letters from Iwo Jima
Lock, Stock and Two Smoking Barrels
The Lost Weekend
M
A Man for All Seasons *
Metropolis
Mr. Smith Goes to Washington
The Night of the Hunter
Nosferatu
Once Upon a Time in America
Pan's Labyrinth
Pirates of the Caribbean: The Curse of the Black Pearl
Platoon
The Prestige
The Princess Bride
Psycho
Rashomon
Ratatouille
Requiem for a Dream
Reservoir Dogs
Rififi
Roman Holiday
Rosemary's Baby
The Searchers
The Seven Samurai
Shadow of a Doubt
Singin' in the Rain
The Sixth Sense
Some Like It Hot
Stand By Me
Strangers on a Train
A Streetcar Named Desire
Terminator 2: Judgment Day
The Third Man
3:10 to Yuma
To Kill a Mockingbird
Toy Story
Toy Story 2
2001: A Space Odyssey
Unforgiven
The Usual Suspects
Vertigo
The Wild Bunch
Witness for the Prosecution
Yojimbo

* Honorable mentions (these have fallen off the bottom of the charts, but they may be back someday)

Movie	Netflix	Hulu	Internet Archive	iTunes Store	LikeTelevision	Public Domain Torrents
Alone in the Dark
Anne B. Real
Astro-Zombies*
The Beast of Yucca Flats*
Bloodlust!
Ed
Going Overboard
Hercules in New York*
The Hillz
The Honeymooners
Horrors of Spider Island
In the Mix
Jail Bait
Marci X
Monstrosity (The Atomic Brain)*
Nine Lives (2002)
Santa Claus Conquers the Martians*
7 Mummies
Snowboard Academy
Track of the Moon Beast

* Honorable mentions (these have fallen off the bottom of the charts, but they may be back someday)

These are listed separately because IMDb doesn't include them in the overall Top 250.