Book Press is a useful plugin for copying written books.
http://dev.bukkit.org/server-mods/bookpress/To make a book press place an iron block on the ground with a piston one block above it (so there is a space in-between then) pointing down towards your iron block. (You will get a message telling you that you have created a Book Press when done correctly)
Next write your book (or use an already written book)
Throw your written book and a Book and Quill (that has not been written in) onto the iron block. The piston will extend down and through the science of Minecraft smash them together and somehow.. copy the book... I don't know... lets just say it's magic. Woo Magic! Now you have 2 copies of your book!