I found this site online,maybe many already know it, but it gives books for free to download (you can always donate, but is not mandatory) for cellphone.
Basically the books are .zip files, with a .jar inside.
Winrar opens .jar files pretty ok, and you can extract the txt files of the book out of them.
It seems like every chapter is a new txt file.
There seem 3 ways of downloading.
The first (2.0) seems regular text. the second (1.0) seems the same text, but with .jar optimized for small screens (128 to 256 pix.width?), the third link per book gives you the HTML version for viewing, which you can save each html separate (takes longer).
http://www.booksinmyphone.com
you think these books are unique,or are they gutenberg books?