Packt has just published a new Drupal mini-series that includes 3 short titles:
The books clock in at 100-140 pages each and give comprehensive reviews and hands-on practice using Drush, setting up Drupal multi-site configuration and building Drupal sites in multiple languages. They all look good from first glance. I'll be posting more detailed reviews of each title as I read them.
Here's the link for more info: http://www.packtpub.com/news/new-drupal-mini-books