BitNami JRubyStack makes JRuby on Rails setup simple. The stack comes bundled with JRuby, Rails, Tomcat, Glassfish Gem, Mysql and Subversion. You can run your Rails app either with Glassfish or make a war and deloy to tomcat. The whole package is distributed under Apache 2.0 License.
There has been few sites that use JRuby proving that JRuby does scale. Thoughtworks project management application mingle is powered by JRuby and Rails. Sun mediacast site is also now running on JRuby and Rails
Matz talks about new Ruby version. Ruby 1.9 beta was released on christmas day at 25 december 2007.
Matz presents about new ruby version at google conference. The new version was earlier known as Yet Another Ruby Virtual machine (YARV). The main feature of Ruby 1.9 is support for platform threads. The Tread class in earlier Ruby VM’s were green threads.