Until July 19th, Jon Krakauer's Into the Wild
is available for free from Borders' new audiobook download service. It's available as a multipart mp3 or wma file.
Two small catches: you have to sign up for a free account with Borders, and Overdrive Media Console needs to be installed on your computer. If you download audiobooks from your public library, you may already have the Overdrive software installed.
Here's the link: