Someone made a list of movies available as of November 2007, but it's grown substantially since then, and grows every day. Here's a chunk of the list to give you an idea, there's more after the jump.
Round Midnight (1986)
...And Justice for All (1979)
1 Giant Leap (2002)
2 Days (2003)
2 Seconds (1998)
3 Nuts in Search of a Bolt (1964)
3 Women (1977)
4 (2005)
The 5th Dimension Travelling Sunshine Show (1971)
6ixtynin9 (1999)
7 Days in September (2004)
7 Mummies (2005)
10 (1979)
10 Minute Solution: Carb Burner (2005)
10 Minute Solution: Fat Blasting Dance Mix (2006)
10 Minute Solution: Kickbox Bootcamp (2005)
10 Minute Solution: Rapid Results Pilates (2006)
10 Minute Solution: Target Toning (2004)
10 Minute Solution: Yoga (2005)
10 Questions for the Dalai Lama (2006)
12 Angry Men (1957)
The 12 Dogs of Christmas (2005)
13 Tzameti (2005)
18 Again (1988)
20,000 Leagues Under the Sea (1916)
20th Century Turning Points (2005)
21 Up (1977)
The 24th Day (2004)
25 Years of Improv Comedy (2006)
29 Palms (2003)
30 Days Until I'm Famous (2004)
30 Rock: Season 1 (2006)
30 Years to Life (2002)
42 Up (1998)
49 Up (2005)
60 Spins Around the Sun (2003)
84 Charing Cross Road (1986)
100 Girls (2000)
100 Kilos (2001)
100 Women (2002)
101 Ways (2000)
200 American (2003)
444 Days to Freedom (1997)
1966 NCAA: Men's Bball: Tex Western vs. Ky (1966)
1982 NCAA: Men's Bball: UNC vs. Georgetown (1982)
1987 NCAA: Men's Bball: Ind. vs. Syracuse (1987)
1996 NCAA: Men's Bball: Ky. vs. Syracuse (1996)
1998 NCAA: Wom. Bball: Tenn vs. La Tech (1998)
1999 NCAA Div. I: Men's Wrestling (1999)
2002 NCAA: Men's Hockey: Minn. vs. Maine (2002)
2004 NCAA: Women's Bball: Tenn vs. UConn (2004)
2005 Glitter Awards (2005)
2005 NCAA: Men's Bball: UNC vs. Illinois (2005)
2006 NCAA: Florida vs. UCLA (2006)
2010: The Year We Make Contact (1984)
The A-Team: Season 1 (1983)
The A-Team: Season 2 (1983)
The A-Team: Season 3 (1984)
The A-Team: Season 4 (1985)
The A-Team: Season 5 (1986)
A.K.A. Cassius Clay (2001)
Aadmi Sadak Ka (1977)
Aaltra (2004)
Aamne Saamne (1967)
Aas (1953)
Abbott & Costello Meet Frankenstein (1948)
Abbott & Costello Meet the Mummy (1955)
The Abductors (1972)
Abhimaan (2000)
About Last Night... (1986)
Abraham: One Man, One God (1994)
According to Spencer (2001)
Action Man: Space Wars (2005)
Acts of Worship (2001)
The Addams Family: Vol. 1 (1964)
Adored: Diary of a Porn Star (2004)
The Adventures of Baron Munchausen (1989)
The Adventures of Ford Fairlane (1990)
Aelita, Queen of Mars (1924)
Afro-Punk (2006)
After Freedom (2004)
After Stonewall (1999)
After the Life: Trilogy 3 (2002)
Against All Odds (1984)
Agata and the Storm (2004)
Agent Abbey (2004)
The Aggressives (2005)
Agnes and His Brothers (2004)
Agnes of God (1985)
The Agronomist (2004)
Aguirre: The Wrath of God (1972)
Airline: Season 1 (2004)
Airto & Flora Purim: Latin Jazz All Stars (1988)
Alabama Love Story (2004)
Alberta Hunter: My Castle's Rockin' (1992)
Alexander Nevsky (1938)
Alexandra's Project (2003)
Alfred Hitchcock Presents: Season 1 (1955)
Alfred Hitchcock Presents: Season 2 (1956)
Alfred Hitchcock Presents: Season 3 (1957)
Alias (2002)
Alice (1988)
Alice in Wonderland (1983)
All Quiet on the Western Front (1930)
All Souls Day (2005)
The Alley Cats (1965)
Almos' a Man (1976)
Almost Heroes (1998)
Almost Normal (2005)
Almost Peaceful (2004)
Alone in a Haunted House (2004)
Along Came Jones (1945)
Amada (1983)
Amadeus (1984)
An Amazing Couple: Trilogy 2 (2002)
The Amazing Panda Adventure (1995)
Amazon Warrior (1998)
America So Beautiful (2001)
America's Castles (2005)
America's Castles: California Dreamers (1996)
America's Castles: Hearst Castle (1995)
America's Houses of Worship (2006)
America's Most Haunted Inns (2004)
America's Western Parks: Canadian Rockies (2006)
America's Western Parks: Great Southwest (2006)
America's Western Parks: Hawaii and Denali (2006)
America's Western Parks: Yellowstone... (2006)
American Alien (2003)
American Beer (1996)
American Cannibal (2006)
American Chain Gang (1999)
American Flyers (1985)
The American Glider Pilots of WWII (2006)
American Gothic: The Complete Series (1995)
The American Hobo (2003)
American Indian Homelands (2006)
American Kickboxer 1 (1991)
American Mullet (2001)
American Ninja 4: The Annihilation (1991)
American Ninja 5 (1993)
American Samurai (1992)
American Short Story: Paul's Case (1980)
The American Soldier (1970)
American Valor (2003)
American Wake (2004)
The Amish: A People of Preservation (2003)
Among Us (2004)
The Amorous Mis-Adventures of Casanova (1976)
Anaconda (1997)
The Anarchist Cookbook (2002)
Ancient Mysteries: Astrology (1996)
Ancient Mysteries: Bigfoot (2005)
Ancient Mysteries: Dragons (2005)
Ancient Mysteries: Myths and Legends (2001)
Ancient Mysteries: The Fountain of Youth (1995)
Ancient Mysteries: UFOs (2005)
Ancient Mysteries: Witches (2006)
The Andersonville Trial (1970)
Andrew Carnegie and the Age of Steel (1997)
Andrew W.K.: Who Knows (1992)
The Andromeda Strain (1971)
Angel on the Right (2002)
Angels: Fulton Sheen (2006)
Animal Crackers: Season 1 (1997)
The Animal Kingdom (1932)
Animaland (1998)
Animals Are Beautiful People (1975)
Anita & Me (2002)
Anna (1987)
Anna Karenina (1977)
Anne B. Real (2003)
Another Planet (1999)
Antares (2004)
Antibodies (2005)
Antonio Carlos Jobim: An All-Star Tribute (1995)
Ants (2002)
Any Friend of Nicholas Nickleby (1982)
Any Which Way You Can (1980)
Anytown, USA (2005)
Apocalypse and the Beauty Queen (2005)
Apostle Paul and the Earliest Churches (2004)
The Architects (1990)
Arguing the World (1998)
Aristide and the Endless Revolution (2005)
Arizona (2004)
Armed and Dangerous (1986)
Around the World in 80 Days (1956)
Around the World with Orson Welles (1955)
Arsenal (1928)
The Art of 16 Bars (2005)
Art of the Devil (2005)
Art of the Devil II (2005)
The Art of Trash (2003)
Article 99 (1992)
As You Like It (1936)
Ascot & Hopetown Classics (2005)
The Asphalt Jungle (1950)
The Assassination of Richard Nixon (2004)
Assault of the Party Nerds (1989)
Assault on Precinct 13 (1976)
Assisted Living (2005)
Astro Zombies (1969)
Astroboy: The Complete Series (1980s) (1980)
Athens, GA: Inside Out (1987)
Attack of the Puppet People (1958)
Attack! (1956)
Auguste Rodin: Hands of Genius (2005)
Auntie Mame (1958)
Aurora Encounter (1986)
Auschwitz: Inside the Nazi State (2005)
Available Men (2006)
Average White Band in Concert: Tonight (2000)
Ayane's High Kick (1996)
B.I.K.E. (2005)
B.U.S.T.E.D. (1999)
Baaba Maal: Live at the Royal (1998)
Baby Miracle: Jonah and the Whale (2005)
Babylon: Past, Present and Future (1996)
The Backyard (2002)
Bacon Brothers: No Food Jokes Tour (2003)
The Bad and the Beautiful (1952)
Bad Day at Black Rock (1954)
Bad Girls from Mars (1991)
Bad Girls from Valley High (2000)
Bad Movie Police Case #2: Chickboxer (2003)
Badlands (1973)
Baja 1000 Classic (2005)
The Ballad of Cable Hogue (1970)
Ballroom Dancing Championships (1993)
Ballykissangel: Series 1 (1996)
Ballykissangel: Series 2 (1997)
Balseros (2003)
The Band Wagon (1953)
The Bank Dick (1940)
Barefoot Adventure (1960)
Barn Burning (1980)
Barney's Great Adventure: The Movie (1998)
Barsaat Ki Raat (1960)
Bartholomew's Gift (2005)
Bartleby (1970)
Basant (1960)
The Base 2: Guilty as Charged (2000)
Baseball the Ripken Way: Defense (2007)
Baseball the Ripken Way: Hitting (2007)
Baseball the Ripken Way: Pitching (2007)
Bastards of Young (2005)
BASToF Syndrome (2004)
Baton Baton Mein (1979)
Battle Arena Toshinden (1996)
Battle Hymn (1957)
The Battle of the Sexes (1928)
Battle's Poison Cloud (2004)
Battlefield Britain (2004)
Battleship Potemkin (1925)
Battlestar Galactica: Complete Epic Series (1978)
Be Good, Smile Pretty (2003)
Be with Me (2005)
Beast from Haunted Cave / Brain ... Die (1962)
Beast of Blood (1971)
The Beat (2003)
The Beat That My Heart Skipped (2005)
Beautiful People (1999)
Beavers: IMAX (1998)
Becket (1964)
Bed and Sofa/Chess Fever: English (1925)
Bed and Sofa/Chess Fever: Russian (1925)
Bedazzled (1967)
Bedrooms and Hallways (2000)
Bedwin Hacker (2003)
Beef (2003)
Beef 2 (2004)
Beef 3 (2005)
Beef 4 (2007)
Been Rich All My Life (2006)
Beer Drinkers in Space (1983)
Before Hollywood There Was Fort Lee, N. J. (1964)
Before Stonewall (1984)
Behind the Scenes (2002)
Being Ron Jeremy (2004)
Being There (1979)
Bela Lugosi: Invisible Ray / Black Friday (1936)
Belle Epoque (1992)
The Bells (1926)
Ben-Hur: Collector's Edition (1959)
Bent (2004)
Berlin: Intimate (2003)
Berlin: Symphony of a Great City / Opus 1 (1927)
Bernice Bobs Her Hair (1976)
The Best of Nature: 25 Years (2006)
Best of the Best (1989)
The Best of the Real West (1992)
Bethlehem Year Zero (2000)
Betty Blowtorch (2003)
Between Heaven and Hell (1956)
Beyond Fear (1993)
Beyond Redemption (1999)
Beyond the Poseidon Adventure (1979)
Beyond the Valley of the Dolls (1970)
Bhagam Bhag (2006)
Big Dreams in Little Hope (2006)
Big Eden (2000)
Big Enough: POV (2004)
Big Guns (2006)
The Big Picture (1989)
The Big Score (1983)
A Bigger Splash (1974)
Bikini Squad (1993)
Bill Engvall: Here's Your Sign (2004)
Bill T. Jones: Dancing to Promised Land (1994)
Billabong Odyssey (2003)
Billy Bragg and Wilco: Man in the Sand (2001)
Bingo (1991)
Bird (1988)
Birdman of Alcatraz (1962)
The Bitter Tears of Petra Von Kant (1972)
The Bituminous Coal Queens of Pennsylvania (2005)
Bizarre (1970)
Black Beauty (1994)
The Black Cat (1941)
Black Cloud (2004)
Black Friday (1994)
Black Girl (1966)
Black Gold: The Story of Oil (1998)
Black Jack (2004)
Black Jack: Collection 1 (1997)
Black Jack: The Movie (1993)
Black Mama, White