ActiveMessaging is an attempt to bring the simplicity and elegance of rails development to the world of messaging. Messaging, (or event-driven architecture) is widely used for enterprise integration, with frameworks such as Java's JMS, and products such as ActiveMQ, Tibco, IBM MQSeries, etc. Now supporting Rails 3 as of version 0.8.0.
Gemfile gem 'activemessaging', '~> 0.11.0'
install gem install activemessaging -v 0.11.0