I like the Drupal Books by Dani Nordin as they are quick reads, easy to understand and work with. As she is a User Experience designer it make sense for her books to be an enjoyable experience.
- Drupal for Designers, 328 pages
- Design and Prototyping for Drupal, 168 pages
- Drupal Development Tricks for Designers, 70 pages
- Planning and Managing Drupal Projects, 96 pages
About Dani Nordin
Tweet her and tell her how much you like her books as well. Dani Nordin is a UX designer out of Boston, as well as a writer and speaker who specializes in helping Drupal teams research, organize and gather consensus on medium to large sites. Her books are available from O’Reilly Media. You can find her work at daninordin.com/