Rails CI build on http://cruisecontrolrb.thoughtworks.com had a problem yesterday, when Ruby started segfaulting somewhere inside Rake. I fixed it last night... by recompiling Ruby on server (?!)
Also, some people here asked to include changelog and a summary of Test::Unit errors in the email notifications CruiseControl.rb sends. It's done.
If you ever see that the CI build is failing when it shouldn't be (because of a problem with the server), do not hesitate to send me a heads-up message.
Your friendly build monkey, Alex