RubyCocoa 0.11.1 was released on 4 June 2007.
I haven’t installed RubyCocoa on my Mac OS X Tiger system yet, but it’s a project I’m watching with great interest because of Apple’s promise of improved support for scripting bridges in Leopard. Citing this Apple page:
To open up the benefits of the Cocoa frameworks to a wider developer audience, Leopard embraces two other highly dynamic languages for use in building Cocoa applications: Ruby and Python. These two languages are an excellent fit for integrating with the Cocoa frameworks, and they both have high quality bridges to Objective-C. These bridges allow you to mix and match Objective-C, Ruby, and Python, allowing you to choose the best tool for the job at hand while using high level Cocoa features such as Key-Value Coding (KVC) and Key-Value Observing (KVO).