However, as I do not use it for books, but for movies, I would like to suggest that someone create a more generic version (a simple lending library) that would allow people to list and lend anything. I would remove the amazon.com connectivity, which isn't necessary unless you're selling books.
Also, as I have a lot of movies in my library, I would like some more robust list navigation tools. For example an alphabetic listing and an alphabetic quick list (A-Z) and maybe several "sort by" listings like most recently added, highest ratings, etc. (similar to the modules).
Otherwise, everything's great! Keep up the good work!