Here, alphabetically, is his list:
Gates of Heaven
La Dolce Vita
The Third Man
2001: A Space Odyssey
For Ebert's comments and details about the films on his list, visit his site via this link: Ten Greatest Films of All Time
My criterion was the same as Ebert's. My list, however, could’ve been comprised entirely of Hitchcock films, and I wish I could’ve included something by Godard, Russ Meyer, John Waters, the Coen Brothers, Todd Solondz, Lars von Trier, and Alejandro Jodorowsky, some gialli, more Tarantino, some Corman, and Terry Zwigoff's Ghost World would definitely be there at number 11. I also had to struggle with not including the following: George A. Romero’s Martin, Brian De Palma’s Carrie, Woody Allen’s Annie Hall and Manhattan, Stanley Kubrick’s Dr. Strangelove and Paths of Glory, Leo McCarey’s Duck Soup, Charles Reisner’s Steamboat Bill Jr., Kaneto Shindô’s Onibaba, Peter Bogdanovich’s The Last Picture Show, Robert Aldrich’s Kiss Me Deadly, Mervyn LeRoy’s I am a Fugitive from a Chain Gang, Howard Hawks’ The Big Sleep, Ken Russell’s The Devils, Lina Wertmüller’s Seven Beauties, Frank Capra's Mr. Smith Goes to Washington, Henri-Georges Clouzot's Les Diaboliques and Wages of Fear, Vittorio De Sica’s Bicycle Thieves and Umberto D., Kurosawa’s Rashomon and Ikiru, David Cronenberg’s The Brood, Robert Wise’s The Haunting, Jacques Tourneur’s The Cat People, and Merian C. Cooper and Ernest B. Schoedsack’s King Kong, amongst a hundred others, but, um… that’s more than ten (Talk about having my cake and eating it too).
My list follows, also alphabetically. What's on yours?