2001: A Space Odyssey (1968)
The African Queen (1952)
Alien (1979)
Annie Hall (1977)
Blade Runner (1982)
Breathless (1966)
Casablanca (1942)
Citizen Kane (1941)
ET (1982)
The Exorcist (1973)
Fast Times At Ridgemont High (1982)
The Good, The Bad, and the Ugly (1968)
Goodfellas (1990)
The Graduate (1967)
The Grand Illusion (1938)
Groundhog Day (1993)
It's A Wonderful Life (1946)
Jaws (1975)
King Kong (1934)
The Lord of the Rings (2001-2003)
The Matrix (1999)
Monty Python and the Holy Grail (1975)
National Lampoon's Animal House (1978)
One Flew Over the Cuckoo's Nest (1975)
Psycho (1960)
Pulp Fiction (1994)
Raiders of the Lost Ark (1981)
Rear Window (1954)
Rebel Without A Cause (1955)
Rocky (1976)
Roman Holiday (1953)
Saving Private Ryan (1998)
Schindler's List (1993)
The Searchers (1956)
The Shawshank Redemption (1994)
The Silence of the Lambs (1994)
Snow White and the Seven Dwarfs (1937)
The Sound of Music (1965)
Star Wars (1977)
Terminator 2: Judgement Day (1991)
This Is Spinal Tao (1984)
Titanic (1997)
To Kill A Mockingbird (1949)
Toy Story (1995)
The Usual Suspect (1995)
Vertigo (1958)
When Harry Met Sally (1989)
The Wizard of Oz (1939)
Note: I have since large portions of some of the films I haven't listed above but not enough to feel qualified that I have seen them
Source:
http://movies.yahoo.com/feature/100-movies-to-see-before-you-die.html