CruiseControl.NET comes with a tool called CCTray that gives you a handy way of monitoring the build status of multiple CruiseControl environments. It works out of the box with other CruiseControl.NET installations but needs a little trick to monitor the Ruby and Java versions (why we need the same app implemented three times is a subject for a rant one day I'm sure...).
For Ruby on Rails projects, set the monitoring URL in CCTray to this:
http://hostname.of.cruisecontrol.rb:3333/XmlStatusReport.aspxIt's not a real ASPX page but it returns XML that CCTray is expecting.
Cruise Control for Java is similar, but different ('natch):
http://hostname.of.cruisecontrol:3333/dashboard/cctray.xmlHad trouble Googling that. :-)