As far as I can remember, Apple/Steve Jobs talked the music industry into dropping DRM on music. As the leading ebooks store Amazon should be the one to push to remove DRM from books.
It's not exactly freedom in the best sense of the word ;)
Are iBooks DRM free? I don't think so ...
iBooks having DRM is (IMO) a problem with the publishing industry, just as DRM on music used to be a problem with the music industry. I want Amazon, and Apple, to push the publishing industry into dropping DRM on books.
The MP3 tip's a good one - thanks.