Anything with a fantastical mechanical component qualifies, as well does Victorian what-what n' all that.
This Wiki contains a Movies list:
http://en.wikipedia.org/wiki/List_of_steampunk_works
More Movies:
http://etheremporium.pbworks.c...Steampunk-Essentials
20,000 Leages Under The Sea (1916)
20,000 Leages Under The Sea (1954)
20,000 Leages Under The Sea (1985)
20,000 Leages Under The Sea (1997)
A Trip to the Moon (1902)
The Abominable Dr. Phibes (1971)
The Adventures of Baron Munchausen (1988)
The Adventures of Brisco County Jr. (1993)
The Adventures of Buckaroo Bonzai across the 8th Dimension (1984)
The Adventures of Mark Twain (1986)
The African Queen (1951)
Arcadia of my Youth (1982)
Around the World in 80 days (2004)
The Assassination Bureau ltd. (1969)
Atlantis: Milo's Return (2003)
Atlantis: The Lost Empire (2001)
Back to the Future Part III (1990)
Black Cat White Cat (1998)
Brazil (1985)
Bride of Frankenstein (1935)
Brotherhood of the Wolf (2001)[French]
Brothers Grimm (2005)
The Call of Cthulhu (2005)
Captain Nemo and the Underwater City (1969)
Casshern (2004)
Castle in the Sky (1986)
City of Ember (2008)
The City of Lost Children (1995)[French]
Chitty-chitty Bang-Bang (1968)
Coraline (2009)
Cronos (1993)
Dark City (1998)
Delicatessen (1981)[French]
Doctor Dolittle (1967)
The Fabulous World of Jules Verne (1957)[Czech]
The Fall (2006)
The Fiendish Plot of Dr. Fu Manchu (1980)
The First Great Train Robbery (1979)
First Men on The Moon (1964)
Five Weeks In A Balloon (1962)
The Four Feathers (1939)
Frankenstein (1931)
Franklyn (2008)
From Hell (2001)
Galaxy Express 999 (1979)
The Golden Compass (2007)
The Great Race (1965)
Hellboy (2004)
Hellboy II: The Golden Army (2008)
The Hindenberg (1975)
House of Wax (1953)
Howl's Moving Castle (2004)
Igor (2008)
The Illusionist (2006)
The Imaginarium of Doctor Parnassus (2009)
The Invisible Man (1933)
Jack Of All Trades (2000)
Jules Verne's Rocket to the Moon (1967)
Khartoum (1966)
King Solomon’s mines (1937)
Labyrinth (1963)
Labyrinth (1986)
League of Extraodinary Gentlemen (2003)
Lemony Snicket's Series of Unfortunate Events (2004)
Little Nemo: Adventures in Slumberland (1989)
The Lost World (1925)
The Man Who Would be King (1975)
Mary Poppins (1964)
Mary Reilly (1996)
Master of the World (1961)
Mirror Mask (2005)
The Mysterious Geographical Explorations of Jasper Morello (2005)
Metropolis (1927)[German]
Metropolis (2001)
Mouse Hunt (1997)
The Mummy Returns (2001)
NausicaƤ of the Valley of the Wind (1984)
Neverwhere (1996)
Perfect creature (2006)
The Prestige (2006)
Prisoner of Zenda (1937)
Professor Dantes and the Severin Conundrum (2008)
Prometheus Triumphant: A Fugue in the Key of Flesh (2009)
Queen Emeraldis (1998)
Return to Oz (1985)
Robot Carnival (1987)
The Rocketeer (1991)
Sherlock Holmes (2009)
Sky Captain and the World of Tomorrow (2004)
Sleepy Hollow (1999)
Son of Frankenstein
Stardust (2007)
Steamboy (2004)
Sweeney Todd: The Demon Barber of Fleet Street (2007)
Time After Time (1979)
The Time Machine (1960)
The Time Machine (2002)
Those Magnificent Men in Their Flying Machines (1965)
Tinman (2007)
Treasure Planet (2002)
Van Hellsing (2004)
Vidocq (2001)
Voyagers! (1982)
Wild Wild West (1999)
The Yellow Submarine (1968)
Young Einstein (1988)
Young Frankenstein (1974)
Young Sherlock Holmes (1985)
Zeppelin (1971)
Zulu (1964)
And on a television note, there are a few Star Trek - The Next Generation episodes that have extremely solid steampunk'ish themes, and I know I'm not the only one that remembers them...