This is a list that was published in Britain around the Millenium. I don't remember who ran the survey, but it's a good list.
  1. Star Wars/The Empire Strikes Back
  2. The Godfather/The Godfather (Part II)
  3. The Shawshank Redemption
  4. Pulp Fiction
  5. Some Like It Hot
  6. Gladiator
  7. It's a Wonderful Life
  8. Blade Runner
  9. Schindler's List
  10. Goodfellas
  11. Jaws
  12. Psycho
  13. Apocalypse Now
  14. One Flew Over The Cuckoo's Nest
  15. The Matrix
  16. Casablanca
  17. The Usual Suspects
  18. Crouching Tiger, Hidden Dragon
  19. Citizen Kane
  20. Raging Bull
  21. ET
  22. Taxi Driver
  23. The Life of Brian
  24. Singin' in the Rain
  25. LA Confidential
  26. The Wizard of Oz
  27. 2001: A Space Odyssey
  28. Kes
  29. Vertigo
  30. Lawrence of Arabia
  31. Fargo
  32. Gone with The Wind
  33. Trainspotting
  34. The Full Monty
  35. The Graduate
  36. Alien
  37. The Silence Of The Lambs
  38. Withnail and I
  39. The Great Escape
  40. Toy Story
  41. The Third Man
  42. Four Weddings And A Funeral
  43. The Sound Of Music
  44. Fitzcarraldo
  45. Deliverance
  46. The Good, The Bad and The Ugly
  47. Kind Hearts and Coronets
  48. Chinatown
  49. The Exorcist
  50. Annie Hall