LibriVox - Public domain books in mp3 and ogg.
You can use the simple search to find books about or in
Esperanto, if you know the title or author. Or you can
use the advanced search to find all books in Esperanto
I've had lots of difficulty trying to download
larger files, like the zipped complete books, from LibriVox
itself. It works for a while, then hangs. Too much indirection or
something going on. Here's a method that works well...
Browse the LibriVox site to find the book you want