Oh man this rocked my socks tonight: Communicating transparently between Ruby and Java using JMS !!!
I spent the day using the web services libraries that come with Ruby to do some SOAP calls on my current project. I had some issues with getting the parameters of my SOAP envelope sorted out with the other team providing the service, but being able to code it in Ruby made it a little less stressful. I was glad to read the link above and realize I'm not the only Java guy that does this sort of thing in Ruby.