From the top 100, I haven't seen:

3 - Rules of the Game/La Regle du jeu (Renoir, Jean; 1939; France)
5 - 8 (Fellini, Federico; 1963; Italy)
10 - Sunrise (Murnau, F.W.; 1927; US)
11 - Singin' in the Rain (Donen, Stanley/Gene Kelly; 1952; US)
14 - L'Atalante (Vigo, Jean; 1934; France)
15 - Raging Bull (Scorsese, Martin; 1980; US)
17 - Passion of Joan of Arc, The (Dreyer, Carl; 1928; France)
19 - Lawrence of Arabia (Lean, David; 1962; UK)
20 - Touch of Evil (Welles, Orson; 1958; US)
21 - La Dolce Vita (Fellini, Federico; 1960; Italy)
22 - Third Man, The (Reed, Carol; 1949; UK)
23 - City Lights (Chaplin, Charles; 1931; US)
24 - Les Enfants du Paradis (Carne, Marcel; 1945; France)
25 - Sunset Blvd. (Wilder, Billy; 1950; US)
26 - Breathless (Godard, Jean-Luc; 1959; France)
27 - General, The [1926] (Keaton, Buster/Clyde Bruckman; 1926; US)
28 - Some Like it Hot (Wilder, Billy; 1959; US)
29 - La Grande Illusion/Grand Illusion (Renoir, Jean; 1937; France)
30 - Jules et Jim (Truffaut, Francois; 1961; France)
33 - L'Avventura (Antonioni, Michelangelo; 1960; Italy-France)
35 - Ordet (Dreyer, Carl; 1955; Denmark)
37 - Pather Panchali (Ray, Satyajit; 1955; India)
39 - Andrei Rublev (Tarkovsky, Andrei; 1966; Russia)
40 - Contempt/Le Mepris (Godard, Jean-Luc; 1963; France-Italy)
42 - Ugetsu Monogatari (Mizoguchi, Kenji; 1953; Japan)
43 - Au Hasard, Balthazar/Balthazar (Bresson, Robert; 1966; France)
44 - Gold Rush, The (Chaplin, Charles; 1925; US)
45 - Wild Strawberries (Bergman, Ingmar; 1957; Sweden)
47 - Persona (Bergman, Ingmar; 1966; Sweden)
48 - 400 Blows, The/Les Quatre Cents Coups (Truffaut, Francois; 1959; France)
49 - Intolerance (Griffith, D.W.; 1916; US)
52 - M (Lang, Fritz; 1931; Germany)
53 - It's a Wonderful Life (Capra, Frank; 1946; US)
54 - Conformist, The (Bertolucci, Bernardo; 1969; Italy-France-Germany)
55 - Modern Times (Chaplin, Charles; 1936; US)
56 - Magnificent Ambersons, The (Welles, Orson; 1942; US)
57 - La Strada (Fellini, Federico; 1954; Italy)
58 - Mirror, The/Zerkalo (Tarkovsky, Andrei; 1976; Russia)
59 - Wizard of Oz, The (Fleming, Victor; 1939; US)
60 - Fanny and Alexander (Bergman, Ingmar; 1982; Sweden)
61 - Nashville (Altman, Robert; 1975; US) 
62 - Wild Bunch, The (Peckinpah, Sam; 1969; US)
63 - Voyage in Italy (Rossellini, Roberto; 1953; Italy)
65 - Greed (von Stroheim, Erich; 1925; US)
67 - Pickpocket (Bresson, Robert; 1959; France)
69 - Earrings of Madame de.../Madame de... (Ophuls, Max; 1953; France-Italy)
70 - Playtime (Tati, Jacques; 1967; France)
71 - L'Age d'Or (Bunuel, Luis; 1930; France)
73 - Sansho the Bailiff (Mizoguchi, Kenji; 1954; Japan)
74 - Pierrot le fou (Godard, Jean-Luc; 1965; France-Italy)
75 - Sherlock, Jr. (Keaton, Buster; 1924; US)
77 - All About Eve (Mankiewicz, Joseph L.; 1950; US)
78 - My Darling Clementine (Ford, John; 1946; US)
79 - Barry Lyndon (Kubrick, Stanley; 1975; UK)
80 - Ikiru (Kurosawa, Akira; 1952; Japan)
81 - Viridiana (Bunuel, Luis; 1961; Spain)
82 - Leopard, The (Visconti, Luchino; 1963; France-Italy)
83 - On the Waterfront (Kazan, Elia; 1954; US)
85 - Decalogue (Kieslowski, Krszystof; 1987; Poland)
86 - Man with a Movie Camera, The (Vertov, Dziga; 1929; USSR)
89 - Last Year at Marienbad (Resnais, Alain; 1961; France-Italy)
90 - Gone with the Wind (Fleming, Victor; 1939; US)
92 - Blue Velvet (Lynch, David; 1986; US)
97 - His Girl Friday (Hawks, Howard; 1940; US)
98 - Double Indemnity (Wilder, Billy; 1944; US) 
99 - Letter from an Unknown Woman (Ophuls, Max; 1948; US)
100 - Gertrud (Dreyer, Carl; 1964; Denmark)

Wow. That's depressing.