I used this resource:

http://rorblog.techcfl.com/2008/02/19/create-and-deploy-a-jruby-app-to-the-glassfish-gem-in-10-minutes-or-less-on-mac-os-x/

How to install jruby on Ubuntu:

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sudo -i
mdir -p ~/src/jruby/trunk
cd ~/src/jruby/trunk
svn svn.codehaus.org/jruby/trunk/jruby/ .
ant
~/src/jruby/trunk/bin/jruby --version

The current version doesn’t work to well with rails' script/console. It is very, very, very slow. So I keep using Yarv until this is fixed. It seems really promising though. Can’t wait for Rubinius to become stable!