JRuby and GlassFish - Bridging the gap
By arungupta on Sep 04, 2007
On Sun promoting Rails ...
I think they recognize what developers want, they are recognizing there is great enthusiasm and passion for Ruby on Rails, and they don't want to miss out on that. To a large extent, they are following the passion, the excitement. ... I welcome Sun and IBM to come in and offer services.
Here are some useful entries (with numerous pointers on screencasts, blogs, tips & extensive feature sets) to get you started: