This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I'm not using IntelliJ, but I recently heard on The Java Posse that there's a new beta version out of IntelliJ (version 8). One of the new features is support for other languages than Java. See this Artima forum post for some more info.
I guess that if current versions of IntelliJ support only Java, it won't be useful for Ruby or Rails.