I am working on a book about Reason, just tips and tricks really. When you were learning Reason is there anything that stands out as a roadblock to learning it? Anything that would be helpful to know upfront? Thanks!
I salute your ambition, writing a book is -not- an easy thing to do, but once its complete you're immortal, meaning you'll always be known as an author.
With that being said, I think a solid FAQ questions section of the book in terms of basic setup.
REWIRE is a big issue as well, maybe provide a brief section on which popular apps will work with REWIRE and screenshots on how to setup.
Reason and Midi-controllers.
What makes Reason such a great application to use. (from your perspective. Many people have the notion "all programs are the same" but provide some "reasons" why the program is great)
Maybe some advanced uses for Reason that you have come across (to draw in hardcore Reason Users)