Responsive Theming for Drupal (2014)
Chapter 1. Responsive Design: A Quick and Dirty Intro
Chapter 2. Responsive, Meet Drupal
Chapter 3. A Short Primer on Sass and Compass
Chapter 4. Responsive Theming With Aurora
Chapter 5. Responsive Theming Using Zen
Chapter 6. Responsive Theming Using Omega
Chapter 7. Some Common Gotchas and Tips
Chapter 8. Alternative Options and Next Steps