Tried Nozbe for ten minutes, looks very promising but it has one deal-breaker for me. Not able to create sub-tasks or sub-projects.

In my Studying Design project I have to do the following:
Learn:
  1. Adobe Photoshop
  2. Adobe InDesign
  3. Adobe Illustrator
They could be primary tasks or sub-projects under Projects list. Under them I need:
  • Lynda.com Course: Adobe InDesign Essentials
  • Lynda.com Course: Illustrator One-on-One

Under that again I would have each chapter of the course listed so I know where I got off each time. Without having that hierarchy the system is not good enough for my need. Really starting to feel like the person in the Princess and the Pea here...