I am a fan of audiobooks. About 1/3 of all of my reading is audiobook. Goodereader Blog has a very good post about the huge growth of audiobooks (especially digital MP3 audiobooks and Audible.com Audiobooks), especially compared to the recent slowing growth of ebooks.
What the growth of audiobooks as an industry means is that there are also a lot more free audiobooks. Like ebooks, I have stopped picking up all free audiobooks and I am only picking up the ones that I am going to read soon (audiobook storage takes a lot more space than ebook storage). But here are a few places I look for audiobooks.
Christianaudio.com
Every month Christianaudio.com has a free book. This month is one of the best Christian books of the 20th century, John Stott’s Basic Christianity.
NoiseTrade
NoiseTrade is a website devoted to giving away music (and now audiobooks) in order to generate interest for independent and lesser known artists. Independent Christian Musician Derek Webb was the co-founder and there has always been good Christian music as a part of the site (but it is not a Christian site).
The current list of 22 complete audiobooks from NoiseTrade is at the bottom of this post. (There are also introductions and first chapters, but I did not link to those.)
Audible.com
Audible.com is my favorite source of audiobooks. They focus on audiobook subscription model (I buy 24 audiobooks for $229, which includes a free daily subscription to either New York Times or Wall Street Journal audio summary, 30% off any audiobooks that I buy without credits and access to a lot of sales).