Christianaudio.com is offering two free audio books in December through December 31.
The first free audio book is From Pearl Harbor to Calvary by Mitsuo Fuchida. According to the website,
"After World War II ended, Fuchida became an evangelist, Christian preacher and frequently traveled to the United States to minister to the Japanese expatriate community. He became a United States citizen in 1966. His autobiography was originally released in 1953, and this edition will be published to coincide with the 70th anniversary of the attack on Pearl Harbor on December 7, 2011."
The second free audio book really needs no introduction. It is Charles Dickens' A Christmas Carol.