Originally Posted by Scott Nielsen
Ah, interesting. If a tag creates a directory structure, does that mean if a book have, say, three tags assigned to it there will be three separate copies created on the Kindle?
No, the only thing the program does is add a book to a collection based on each subdirectory it's in. For example, if your book is sent from Calibre to this user-defined location:
book.mobi will be added to the Custom_Field_value (Read/unread, etc., whatever you output), Author, and Series collections.