Here's the deal: ThoughtWorks first product offering is called Mingle. The kicker is, it will be deployed on JRuby. I have been involved with this for a while, getting everything in good working order, and I'm sure TW won't regret this decision. JRuby is important in their strategy, and Mingle, as the first commercial JRuby application is a huge deal.
You should go and read more about this exciting news at http://studios.thoughtworks.com/2007/5/7/mingle-to-run-on-jruby.