As most of you know I am a huge fan of Calibre to organize my books and convert them for my kindle.
I recently cam across this software which could be of use to some of you and there is also an app version for iphones and ipads.
You can find the link here
Hope this is helpful, I also use GoodReads to help track my reading list and give me more information on the books in the library as it gives you a synopsis as well as the ability to mark book read, to read, and finds similar books. There are so many great features to goodreads be sure to follow the link from the side panel to see the books in our library. There is also a iPad app that stores all your information on your ipad. And if you have a newish kindle there is an ability to automatically post when you have finished reading as read to a book and also to view more content.