How to theme/customize a book page?

Hi All,

I would like to make use of built-in book module for hierarchical structure of nodes and make use of the corresponding book navigation block. And I am wondering how could we customize a book page? Is it possible to have per-book-page customization?

It seems I can also make use of "node" and "taxonomy" modules to have the same effect but I am not that familiar with that. If there is some modules capable of doing this, please give me a hint :)

-- Drake