Once you are done with GettingStarted, you can try the samples that are included:
This will build every sample project. Note that some projects might not build unless you install some third-party dependencies (for example those based on SIMBL).
There are also some CodeSnippets around for your pleasure.
That's it, go play!
$ cd /Developer/Examples/RubyCocoa
$ mkdir ~/Desktop/RubyCocoaApps
$ ruby buildall.rb ~/Desktop/RubyCocoaApps
$ open ~/Desktop/RubyCocoaApps
$ mkdir ~/Desktop/RubyCocoaApps
$ ruby buildall.rb ~/Desktop/RubyCocoaApps
$ open ~/Desktop/RubyCocoaApps
This will build every sample project. Note that some projects might not build unless you install some third-party dependencies (for example those based on SIMBL).
There are also some CodeSnippets around for your pleasure.
That's it, go play!

