Scripting Layer for Android
code.google.com
code.google.com
It's indeed neat, but releases and progress has been slow-going. The last releases were in early 2011. I don't know of anyone else who uses it, besides myself, but it's cool.
I think stuff like Phonegap has really eaten its lunch and stolen its thunder.
>Ruboto allows you to run Ruby scripts on Android devices. Using Ruby code, you have access to the complete Android API. Currently, we have 2 offerings: ruboto and ruboto-irb. Ruboto is based on JRuby.
The sl4a Ruby interpreter is based on Ruboto. So accesing the Android API with Ruby is posible. JRuby is Java after all, check their site.
P.S. I wish I had the skill to help out in this project.