After answering the "Are You A Movie Buff?", I've seen that Mike Norton followed with a listing of movies seen from the American Film Institute's 100 Greatest Movies list, as did Mark Gibson. And here's mine, with a couple of additional notations:

* = Those I've seen
X = Those I'm unlikely to ever watch, including ones I've already seen and have no desire to watch again.
M = The few I actually saw in a theater.
D = The fewer I actually saw at the Drive-In.
! = Those I've watched more than once for various reasons.
# = Those I own on DVD.
L = Those I own on Laserdisc.
V = Those I own on VHS

1. CITIZEN KANE (1941)*!
2. CASABLANCA (1942)*X
3. THE GODFATHER (1972)*#
4. GONE WITH THE WIND (1939)*!M #
5. LAWRENCE OF ARABIA (1962)
6. THE WIZARD OF OZ (1939)*!M
7. THE GRADUATE (1967)*!
8. ON THE WATERFRONT (1954)
9. SCHINDLER'S LIST (1993)*M
10. SINGIN' IN THE RAIN (1952)*#
11. IT'S A WONDERFUL LIFE (1946)*! #
12. SUNSET BOULEVARD (1950)*
13. THE BRIDGE ON THE RIVER KWAI (1957)
14. SOME LIKE IT HOT (1959)*!
15. STAR WARS (1977)*!MLV
16. ALL ABOUT EVE (1950)
17. THE AFRICAN QUEEN (1951)
18. PSYCHO (1960)*!
19. CHINATOWN (1974)
20. ONE FLEW OVER THE CUCKOO'S NEST (1975)*
21. THE GRAPES OF WRATH (1940)
22. 2001: A SPACE ODYSSEY (1968)*
23. THE MALTESE FALCON (1941)*#
24. RAGING BULL (1980)*M#
25. E.T. THE EXTRA-TERRESTRIAL (1982)*!M #
26. DR. STRANGELOVE (1964)*
27. BONNIE AND CLYDE (1967)
28. APOCALYPSE NOW (1979)*M#
29. MR. SMITH GOES TO WASHINGTON (1939)*
30. THE TREASURE OF THE SIERRA MADRE (1948)*
31. ANNIE HALL (1977)*
32. THE GODFATHER PART II (1974)*#
33. HIGH NOON (1952)*!L
34. TO KILL A MOCKINGBIRD (1962)*!#
35. IT HAPPENED ONE NIGHT (1934)
36. MIDNIGHT COWBOY (1969)*#
37. THE BEST YEARS OF OUR LIVES (1946)
38. DOUBLE INDEMNITY (1944)*
39. DOCTOR ZHIVAGO (1965)
40. NORTH BY NORTHWEST (1959)*!
41. WEST SIDE STORY (1961)
42. REAR WINDOW (1954)*
43. KING KONG (1933)*! #
44. THE BIRTH OF A NATION (1915)
45. A STREETCAR NAMED DESIRE (1951)
46. A CLOCKWORK ORANGE (1971)*
47. TAXI DRIVER (1976)
48. JAWS (1975)*!L
49. SNOW WHITE AND THE SEVEN DWARFS (1937)*!
50. BUTCH CASSIDY AND THE SUNDANCE KID (1969)
51. THE PHILADELPHIA STORY (1940)
52. FROM HERE TO ETERNITY (1953)
53. AMADEUS (1984)*X
54. ALL QUIET ON THE WESTERN FRONT (1930)
55. THE SOUND OF MUSIC (1965)
56. M*A*S*H (1970)*
57. THE THIRD MAN (1949)
58. FANTASIA (1940)* M#LV
59. REBEL WITHOUT A CAUSE (1955)*
60. RAIDERS OF THE LOST ARK (1981)*!M #LV
61. VERTIGO (1958)*
62. TOOTSIE (1982)*!M
63. STAGECOACH (1939)
64. CLOSE ENCOUNTERS OF THE THIRD KIND (1977)*!M
65. THE SILENCE OF THE LAMBS (1991)*!M
66. NETWORK (1976)*D
67. THE MANCHURIAN CANDIDATE (1962)
68. AN AMERICAN IN PARIS (1951)
69. SHANE (1953)
70. THE FRENCH CONNECTION (1971)
71. FORREST GUMP (1994)*! #L
72. BEN-HUR (1959)
73. WUTHERING HEIGHTS (1939)
74. THE GOLD RUSH (1925)*
75. DANCES WITH WOLVES (1990)*L
76. CITY LIGHTS (1931)
77. AMERICAN GRAFFITI (1973)*!M
78. ROCKY (1976)*#
79. THE DEER HUNTER (1978)*M
80. THE WILD BUNCH (1969)
81. MODERN TIMES (1936)
82. GIANT (1956)
83. PLATOON (1986)
84. FARGO (1996)*
85. DUCK SOUP (1933)*!#
86. MUTINY ON THE BOUNTY (1935)
87. FRANKENSTEIN (1931)*!#
88. EASY RIDER (1969)
89. PATTON (1970)
90. THE JAZZ SINGER (1927)
91. MY FAIR LADY (1964)
92. A PLACE IN THE SUN (1951)
93. THE APARTMENT (1960)*
94. GOODFELLAS (1990)*!#L
95. PULP FICTION (1994)*!#L
96. THE SEARCHERS (1956)
97. BRINGING UP BABY (1938)
98. UNFORGIVEN (1992)*!D#
99. GUESS WHO'S COMING TO DINNER (1967)
100. YANKEE DOODLE DANDY (1942)