Well this is a list, shall try and update with Youtube links if possible when look for some of them.
50. Night of the Iguana (1964)
49. Anatomy of a Murder (1959)
48. The Man Who Wasn't There (2001)
47. Magnolia (1999)
46. Watchmen (2009)
45. The Manchurian Candidate (1962)
44. The Big Sleep (1946)
43. Eyes Wide Shut (1999)
42. Little Children (2006)
41. Maximum Overdrive (1986)
40. South Park: Bigger Longer & Uncut (1999)
39. Zabriskie Point (1970)
38. Face/Off (1997)
37. The Strangers (2008)
36. Spider-Man (2001)
35. The Lord of the Rings (2001-2003)
34. The Minus Man (1999)
33. Where the Wild Things Are (2009)
32. The Matrix (1999)
31. Corruption (1968)
30. Femme Fatale (2002)
29. Point Blank (1967)
28. The Bishop's Wife (1947)
27. A Night at the Opera (1935)
26. Speed (1994)
25. Real Life (1979)
24. Schindler's List (1993)
23. Red Eye (2005)
22. Sin City (2005)
21. Strange Days (1995)
20. She's Gotta Have It (1986)
19. Unbreakable (2000)
18. Sleeper (1973)
17. Charade (1963)
16. GoldenEye (1995)
15. Pulp Fiction (1994)
14. Garden State (2005)
13. Mr. Sardonicus (1961)
12. Independence Day (1996)
11. The Blair Witch Project (1999)
10. The Shining (1980)
9. Mission: Impossible (1996)
8. The Texas Chain Saw Massacre (1974)
7. Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)
6. Citizen Kane (1941)
5. Comedian (2002)
4. Miracle on 34th Street (1947)
3. Cloverfield (2008)
2. Psycho (1960)
1. Alien (1979)
http://www.ifc.com/news/2009/06/50-g...t-trailers.php