TorqueBox is the ninja-grade Ruby application platform integrating popular technologies such as Ruby-on-Rails, while extending the footprint of Ruby applications to include support for Job Scheduling, Task Queues, SOAP Handling, and Telecom.
TorqueBox provides an all-in-one environment, built upon the latest, most powerful JBoss AS Java application server. Functionality such as clustering and cloud deployment is included right out-of-the-box.

I'm not yet sure what to think of this. Having a robust JMS implementation available and tightly integrated might be useful, and the whole JBoss association might help with Ruby/Rails "enterprise" credibility.

Sigh. Another thing to add to my things-to-look-at queue.