Something I'm trying out. In the mean time, here are some links that seem worthwhile:
Rolling with Ruby on Rails by Curt Hibbs part 1 and part 2 Simple CRUD example
about Rails on Swik.
bparanj's rails cheat sheets
Of course, this makes me want to learn more about the Ruby language:
Programming Ruby - The Pragmatic Programmer's Guide by David Thomas and Andrew Hunt or in frames
RJava is a means to call Java from Ruby. It's fairly primitive at the moment and uses TCP/IP for the call.
JRuby is an implementation of Ruby written in Java.
Ruby/Python allows calling Python code within Ruby.
Then there's available code
Current version of Ruby User's Guide
Ruby Conventions and more
More Ruby conventions for Java programmers