Apple has posted an interesting new tutorial on developing OS X applications with MacRuby. MacRuby is an implementation of the Ruby programming language "ported to run directly on top of Mac OS X core technologies such as the Objective-C common runtime and garbage collector, and the CoreFoundation framework."
What this means is that applications written with MacRuby can be a full-fledged Cocoa application with all the advantages that entails. The tutorial will take you through the process of installing MacRuby as well as building a sample application with Xcode. So if you've ever wanted to get started thinking about developing for the Mac, but have always been intimidated by Objective-C (which pretty much describes me), playing around with MacRuby might be just the ticket to get you started.