Christian Audio has two free audio books for download this month: Dietrich Bonhoeffer's The Cost of Discipleship and John Piper's 50 Reasons Why Jesus Came to Die.
Go to Christianaudio.com, click on the free downloads button and check it out. You will have to register, but it is well worth it. They have a free book each month, so check it out regularly. You'll notice that they have some good books on sale, too.
Let me end with a caution: not everything they have there is good, so use discernment! This month's titles are well worth your time, however.
HT - JT