I just discovered this magnificent new product and wanted to share it.
RubyMotion is a very well documented (and apparently well-written) tool to develop native iOS applications with Ruby.
They have modeled the Rails framework and constructed a command-line tool that leverages the familiar RAKE command.
There are already numerous sample programs and very good 'tutorial' documentation.
This product so impressed me that I purchased a license immediately. As I make progress, playing and experimenting, I will post some more.