Drupal has attracted a lot of attention for the book authors during the last couple of years. A lot of books for the popular CMS have been published, with content targeted from beginners to advanced users, ranging from end users to core and third-party module programmers.
My new Drupal book arrived about three weeks ago. "Drupal Multimedia" was written by Aaron Winborn and is published by Packt Publishing, a house that has published a variety of books targeting Drupal, Joomla, PHP, etc. The book is targeted to users that want to learn how to unleash the multimedia features of Drupal with the use of third party modules. It's targeted mainly to intermediate and advanced users. Beginners could find their way through it, although they will probably find the content regarding theming somewhat confusing (because of their little knowledge of the Drupal inner mechanism and not because of the way the book is written).