If you have iBooks then this is the App for you.
It allows you turn almost any document into the ePub format so that you can store it in your iBook Library. Makes for reading a lot easier
Calibre Conversion Software Bonus is it's free
Also here are the Instructions for it
Calibre Instructions I have used it to turn quite a few documents into books. Including some books i had been looking for which where only available as text docs.
It's very quick as well. It took me 8 mins to convert 107 documents into books (some of which have over 700 pages)