You can use this page to email Greg Molnar about Hybrid Development with RubyMotion.
About the Book
If you have limited resources in your team, building a hybrid mobile application can help you to get on the market quickly. If you are a Ruby developer and you want to use your beloved language for mobile development, then this book will help you to get started by teaching how to build a simple WebView based mobile app, and then teaching you how to migrate parts of your application to native code.