Christianaudio.com is the best audio company I know of because every month they give away a free audio book. For the month of June you can get free: Hearing God: Developing a Conversational Relationship with God by Dallas Willard.
I reviewed this book a little while ago on my blog. Be sure to download it before June ends! Here is an excerpt from that review:
I just love reading Willard because of his ability to make complex ideas simple. He doesn’t use a lot of big words (which is quite unusual for a philosopher), and he sprinkles his writing with stories and quotes from a wide variety of sources, ranging from The Stanford Wives to Kierkegaard. … His big point is that hearing God is not something that usually happens in big dramatic ways, but in the small still whisper and in the ordinary things of life.
- The Cross and Discipleship – A set of three different sessions for free from Christianaudio.com with Dallas Willard from the CrossWalk2003 confrence.
- Review of the Explicit Gospel by Matt Chandler