The Wonderful Wizard of Oz (1910) is the earliest surviving film version of L. Frank Baum's 1900 novel, made by the Selig Polyscope Company without Baum's direct input. It was created to fulfill a contractual obligation associated with Baum's personal bankruptcy caused by The Fairylogue and Radio-Plays, from which it was once thought to have been derived. It was partly based on the 1902 stage musical, though much of the film deals with the Wicked Witch of the West, who does not appear in the musical.
The Magic Cloak of Oz is a 1914 film directed by J. Farrell MacDonald. It was written by L. Frank Baum and produced by Baum and composer Louis F. Gottschalk. The film is an adaptation of Baum's novel, Queen Zixi of Ix.
UPDATE 9 July 2010:
The original upload was plagued with problems and has been replaced by a higher quality file encoded directly from a new PAL DVD transfer from the original print.