io9's List of the 50 Scariest Movies of All Time

Here's the countdown from io9's site:

41-50:
50. Something Wicked This Way Comes (1983)
49. An American Werewolf In London (1981)
48. Midnight Meat Train (2008)
47. Re-Animator (1985)
46. Cat People (1942)
45. La Conquête du Pôle ("The Conquest of the Pole") (1912)
44. The Birds (1963)
43. The Blob (1958)
42. The Crazies (2010)
41. The Mist (2007)

31-40:
40. The Cabinet of Dr. Caligari (1920)
39. Hellraiser (1987)
38. Frankenstein (1931)
37. Dawn of the Dead (1978)
36. Rosemary's Baby (1968)
35. Drag Me To Hell (2009)
34. Invasion of the Body Snatchers (1978)
33. Cloverfield (2008)
32. Predator (1987)
31. Candyman (1992)

21-30:
30. Suspiria (1977)
29. Night of the Living Dead (1968)
28. Nosferatu (1922)
27. The Hills Have Eyes (1977)
26. Rec (2007)
25. Signs (2002)
24. The Omen (1976)
23. The Last Exorcism (2010)
22. Pet Sematary (1989)
21. Jacob's Ladder (1990)

11-20:
20. The Ruins (2008)
19. Cabin Fever (2002)
18. Insidious (2011)
17. Friday The 13th (1980)
16. 28 Days Later (2002)
15. Blair Witch Project (1999)
14. The Haunting (1963)
13. Nightmare on Elm Street (1984)
12. Event Horizon (1997)
11. Carrie (1976)

1-10:
10.The Descent (2005)
9. The Ring (2002)
8. Phantasm (1979)
7. Paranormal Activity (2007)
6. The Fly (1986)
5. The Thing (1982)
4. The Exorcist (1973)
3. Poltergeist (1982)
2. The Shining (1980)
1. Alien (1979)

I've seen the few in bold print.