I'd recommend Mirah (https://github.com/mirah/mirah) and Pindah (https://github.com/mirah/pindah) as an almost Ruby over Ruboto for Android due to slow startup times from the poor performance of Reflection on Dalvik.

Has anyone built and shipped an app that is currently in the Android Marketplace using Ruboto?

What's the smallest possible app you can build and ship using it?

What are the performance characteristics like?

Search for 'Ruboto IRB' in Android marketplace. Perhaps every Rubyist owning an Android should at least have an IRB in his pocket :).

This encourages me to write an app for Android.

This encourages me to use Ruby.

I keep waiting in vain for a real Python option on Android, but Jython-on-Android was abandoned in favor of that lobotomized "android scripting environment" mess.

I'm not Ruby's biggest fan, but I'll take it over Java any day.

ruboto code on github https://github.com/ruboto

at least the name is cool :-)