takao7 published a book "Mac OS X Desktop Application Development with Ruby" (『RubyによるMac OS Xデスクトップアプリケーション開発入門』)
I am interested in developing OS X local applications with Ruby very much.
This book is written in Japanese, but I think somebody will translate it to English.
I'm also interested the abbreviation name of this book's title RHC. The title reminds rubyists the Ruby Bible RHG: Ruby Hacking Guide by Minero Aoki.