The last 5 weeks, a team consisting of me, Alexey Verkhovsky, Matt Wastrodowski and Toby Tripp from ThoughtWorks, and Rich Manalang from Oracle have created a new application based on an internal Oracle application. This site is called Oracle Mix, and is aimed to be the way Oracles customers communicate with Oracle and each other, suggesting ideas, answering each others questions and generally networking.
Why is this a huge deal? Well, for me personally it's really kinda cool... It's the first public JRuby on Rails site in existance. It's deployed on the "red stack": Oracle Enterprise Linux, Oracle Application Server, Oracle Database, Oracle SSO, Oracle Internet Directory. And JRuby on Rails.
It's cool. Go check it out: http://mix.oracle.com.