downloading e-audio

At last the impetus to download a book to my MP3. I have been using it, but listening to radio when I go out walking early in the morning. However, I can't download to my linux computer, so I'll try it at home. The Maryland Overdrive site was visually more appealing, but frustrating because there were so few "copies" of titles available of items in which I was interested. The NetLibrary site did have copies available albeit, many in the public domain.