[frist45]

I wrote a book called Build a Ruby Gem ( http://brandonhilkert.com/books/build-a-ruby-gem/). After release, it's required very little work and has totaled about $20k in 9 months since launch.

[gedrap]

How did you market this book? Do you think having 1k twitter followers helped with sales?

[frist45]

Mostly in places I knew Rubyists hang out online. Message boards, link aggregators, etc. Twitter helped very little towards sales. Although I use Twitter here and there, focusing on capturing emails was more valuable.