I found you plan to add Glassfish support for RubyMine 3.0. It would be interesting to add Torquebox support. It is JRuby on JBoss full stack solution. It works fine with Rails or any Rack-based framework including Merb and Sinatra. JBoss 5 is also more mature than Glassfish 3. And Torquebox adds some interesting JBoss services for Rails/Rack application.