There are a number of projects out in Webland to create and provide free audio recordings of books that are in the public domain.
Like Librivox.org, where volunteers record individual chapters of books in a collaborative framework. Nice!
Here's the link to the Librivox recording of Little Men by Louisa May Alcott. You can download individual chapters or a zip file of the whole enchilada.
There is also AudioBooksFor Free. The name says it all.
There are other similar audiobook projects/resources out there. Rather than write them all here, read this item from resourceshelf.com.