Ruby off the Rails, a short introduction to Ruby for Java-ists, worth a read if you want to know what the excitement is all about:
Ruby on Rails is just one facet of what makes Ruby great, just like EJB is only part of the Javaâ„¢ enterprise platform. Andrew Glover digs beneath the hype for a look at what Java developers can do with Ruby, all by itself.
Via Semergence.