The Man and His Genius - Like Orson Welles, this site is many-faceted, covering not only his movies, but also his stage, radio, and TV appearances, as well as his books, romances, etc.
The Estate of Orson Welles - Website run by Nathaniel S. Johnson includes lots of biographical and career information.
The G.O.W. Pages - That stands for George Orson Welles, of course. Includes a biography, filmography, quotes, photo gallery, and more.
The Unseen Orson Welles - A listing of the over 100 films and stage plays that Orson Welles conceived, wrote, planned or partially shot, but never completed. Most of the scripts and partially shot films are held by Welles’ last companion, Oja Kodar.
The Mercury Theatre on the Air - A history, show listing, and more for the great radio dramatic show from the 1930s led by Orson Welles and John Houseman.
Sullivan Parker's Orson Welles Page - Consists of three sections: Images, with several reproductions of storyboards and artist's drawings from Citizen Kane; the author's thoughts on the film; and some annotated links (mostly outdated).