Bad news. Previous RubyCocoa 0.4.1 binary package for Tiger was broken. Good news! We have released new RubyCocoa-0.4.1-tiger.dmg without the issue.
http://prdownloads.sourceforge.net/rubycocoa/RubyCocoa-0.4.1-tiger.dmg?download
MD5: a38e14cb592e39b2460d3a1ec9a081bc
(old file's MD5: 4c8e25313e07800b7b4c3b610f728b48)
= more info =
The package did not contain following files:
* lib/ruby/site_ruby/powerpc-darwin8.0/rubycocoa.bundle
* lib/ruby/site_ruby/osx/*.rb
A ruby script on command line fails at `require "osx/cocoa"',
but an RubyCocoa application runs without problem.