First of all congratulations on the CustomPress plugin... opens many possibilities for our blog networks...
Is there any way to have a Custom Post Type as an option of another Custom Post Type?
For example, if I want to create a books website, I can create a custome post type "books" linked to the single-books.php file. If I add the author as a taxonomy, I will be able to list all books from a specific author.
Nevertheless, I would also like Author to be a custom post type, so that I can add their biography and other important information.
So, the specific question in this example is: can I create two custom post types "Books" and "Authors", and have "Authors" be an option of "Books"?