I'm quite disappointed that nothing from the Repo Man soundtrack appears on this list.
Full List: AFI's Top 100 Songs from U.S. Movies
1. "Over the Rainbow," "The Wizard of Oz," 1939
2. "As Time Goes by," "Casablanca," 1942
3. "Singin' in the Rain," "Singin' in the Rain," 1952
4. "Moon River," "Breakfast at Tiffany's," 1961
5. "White Christmas," "Holiday Inn," 1942
6. "Mrs. Robinson," "The Graduate," 1967
7. "When You Wish Upon a Star," "Pinocchio," 1940
8. "The Way We Were," "The Way We Were," 1973
9. "Stayin' Alive," "Saturday Night Fever," 1977
10. "The Sound of Music," "The Sound of Music," 1965
11. "The Man That Got Away," "A Star Is Born," 1954
12. "Diamonds Are a Girl's Best Friend," "Gentlemen Prefer Blondes," 1953
13. "People," "Funny Girl," 1968
14. "My Heart Will Go On," "Titanic," 1997
15. "Cheek to Cheek," "Top Hat," 1935
16. "Evergreen (Love Theme From 'A Star Is Born')," "A Star Is Born," 1976
17. "I Could Have Danced All Night," "My Fair Lady," 1964
18. "Cabaret," "Cabaret," 1972
19. "Some Day My Prince Will Come," "Snow White and the Seven Dwarfs," 1937
20. "Somewhere," "West Side Story," 1961
21. "Jailhouse Rock," "Jailhouse Rock," 1957
22. "Everybody's Talkin'," "Midnight Cowboy, 1969
23. "Raindrops Keep Fallin' on My Head," "Butch Cassidy and the Sundance Kid," 1969
24. "Ol' Man River," "Show Boat," 1936
25. "High Noon (Do Not Forsake Me, Oh My Darlin')," "High Noon," 1952
26. "The Trolley Song," "Meet Me in St. Louis," 1944
27. "Unchained Melody," "Ghost," 1990
28. "Some Enchanted Evening," "South Pacific," 1958
29. "Born to Be Wild," "Easy Rider," 1969
30. "Stormy Weather," "Stormy Weather," 1943
31. "Theme From 'New York, New York,"' "New York, New York," 1977
32. "I Got Rhythm," "An American in Paris," 1951
33. "Aquarius, "Hair," 1979
34. "Let's Call the Whole Thing Off," "Shall We Dance," 1937
35. "America," "West Side Story," 1961
36. "Supercalifragilisticexpialidocious," "Mary Poppins," 1964
37. "Swinging on a Star," "Going My Way," 1944
38. "Theme From 'Shaft,"' "Shaft," 1971
39. "Days of Wine and Roses," "Days of Wine and Roses," 1963
40. "Fight the Power," "Do the Right Thing," 1989
41. "New York, New York," "On the Town," 1949
42. "Luck Be a Lady," "Guys and Dolls," 1955
43. "The Way You Look Tonight," "The Swing Time," 1936
44. "Wind Beneath My Wings," "Beaches," 1988
45. "That's Entertainment," "The Band Wagon," 1953
46. "Don't Rain on My Parade," "Funny Girl," 1968
47. "Zip-a-Dee-Doo-Dah," "Song of the South," 1947
48. "Whatever Will Be, Will Be (Que Sera, Sera)," "The Man Who Knew Too Much," 1956
49. "Make 'Em Laugh," "Singin' in the Rain," 1952
50. "Rock Around the Clock," "Blackboard Jungle," 1955
51. "Fame," "Fame," 1980
52. "Summertime," "Porgy and Bess," 1959
53. "Goldfinger," "Goldfinger," 1964
54. "Shall We Dance," "The King and I," 1956
55. "Flashdance ... What a Feeling," "Flashdance," 1983
56. "Thank Heaven for Little Girls," "Gigi," 1958
57. "The Windmills of Your Mind," "The Thomas Crown Affair," 1968
58. "Gonna Fly Now," "Rocky," 1976
59. "Tonight," "West Side Story," 1961
60. "It Had to Be You," "When Harry Met Sally ...," 1989
61. "Get Happy," "Summer Stock," 1950
62. "Beauty and the Beast," "Beauty and the Beast," 1991
63. "Thanks for the Memory," "The Big Broadcast of 1938," 1938
64. "My Favorite Things," "The Sound of Music," 1965
65. "I Will Always Love You," "The Bodyguard," 1992
66. "Suicide Is Painless," "M-A-S-H," 1970
67. "Nobody Does It Better," "The Spy Who Loved Me," 1977
68. "Streets of Philadelphia," "Philadelphia," 1993
69. "On the Good Ship Lollipop," "Bright Eyes," 1934
70. "Summer Nights," "Grease," 1978
71. "The Yankee Doodle Boy," "Yankee Doodle Dandy," 1942
72. "Good Morning," "Singin' in the Rain," 1952
73. "Isn't It Romantic?" "Love Me Tonight," 1932
74. "Rainbow Connection," "The Muppet Movie," 1979
75. "Up Where We Belong," "An Officer and a Gentleman," 1982
76. "Have Yourself a Merry Little Christmas," "Meet Me in St. Louis," 1944
77. "The Shadow of Your Smile," "The Sandpiper," 1965
78. "9 to 5," "9 to 5," 1980
79. "Arthur's Theme (Best That You Can Do)," "Arthur," 1981
80. "Springtime for Hitler," "The Producers," 1968
81. "I'm Easy," "Nashville," 1975
82. "Ding Dong the Witch Is Dead," "The Wizard of Oz," 1939
83. "The Rose," "The Rose," 1979
84. "Put the Blame on Mame," "Gilda," 1946
85. "Come What May," "Moulin Rouge!" 2001
86. "(I've Had) the Time of My Life," "Dirty Dancing," 1987
87. "Buttons and Bows," "The Paleface," 1948
88. "Do Re Mi," "The Sound of Music," 1965
89. "Puttin' on the Ritz," "Young Frankenstein," 1974
90. "Seems Like Old Times," "Annie Hall," 1977
91. "Let the River Run," "Working Girl," 1988
92. "Long Ago and Far Away," "Cover Girl," 1944
93. "Lose Yourself," "8 Mile," 2002
94. "Ain't Too Proud to Beg," "The Big Chill," 1983
95. "(We're Off on the) Road to Morocco," "Road to Morocco," 1942
96. "Footloose," "Footloose," 1984
97. "42nd Street," "42nd Street," 1933
98. "All That Jazz," "Chicago," 2002
99. "Hakuna Matata," "The Lion King," 1994
100. "Old Time Rock and Roll," "Risky Business," 1983
http://www.afi.com/tvevents/100years/songs.aspx