I've been working on a database for books for some time now. Recently I managed to put the whole thing online and workable [more or less].
You can have a look here: http://archive.denisbehr.de/
[I am not sure about how long the link will be available at the moment.]
There are still enough bugs to keep me busy. If you happen to find mistakes in content or programming or have other suggestions feel free to drop an email. I do have some plans for other features already.
Exactly 100 [randomly chosen] books are filed at the moment.
It is still very much work in progress and the layout is quite basic, but I thought perhaps you are interested.