The Mercury Theatre on the Air has the Orson Welles production of GKC's The Man Who Was Thursday (September 5, 1938) available for free download. Many other shows are also available; e.g., H.G.Wells' The War of the Worlds and Charles Dickens' The Pickwick Papers. Burn a CD of that MP3 and have a family night gathered around the radio - just like they used to do on The Waltons. Illiteracy is no excuse. (cheers to Matthew Lickona @ GodsBody for the link to The Mercury Theatre on the Air)
For iPodders who would like the full audio book: Fumare: law, culture and catholicism... up in smoke posts that Audible.com is offering "buy one, get one free" on some of their titles, and notes that The Man Who Was Thursday is among the special offer titles.
For Luddites who prefer non-digital technology: Audio tapes of the Welles production of Thursday can be purchased through The American Chesterton Society.