I used to use an application specific to ebooks called
My Ebook Library, but the developer and his site have disappeared and I can't install it on my new PC and add my books.
It's an ebook library management and cataloging application that has the ability to look up info online based on the book's ISBN, and can rename files according to the correct name of the book and its author. The application made you find the ISBN yourself, either within the book or on amazon.com, and then it would pull the rest of the info from the developer's cached database (which is now gone).
Since then, another developer, that was also a user and lover of the same software, has decided to recreate its functionality (and then some) in his own application.
His is supposed to have the ability to automatically scan the books to find the ISBN contained within the books themselves, and then pull the additional data directly from amazon, thereby making it that much better. (it also has backup/import/export options the original didn't have)
I have not tried his app, but I may plan on it at some point. I am just waiting till he finishes it first.
His alpha/beta/whatever it is, is currently free, but he plans on charging for it once it's finished. That's why I am waiting. I don't want to try it, fall in love with it and get hit with a surprise price tag that I can't afford, when the final version is released.
But if you would like to give it a try, it's called
Home Library