I just found this website called aNobii where you type in the 10 digit ISBN number on the back of your books and it automatically finds the book through its database and adds it to your bookshelf.
Facebook had something similar to this but for some reason when Facebook went to new Facebook, it made it impossible to use the Bookshelf application. So I did a search and found this. I added it as a widget to the sidebar which shows 1 of my books at random at a time. It has a link that brings you right to my bookshelf on the aNobii website.
I think it’s neat hehe.