> As for a .pkg...there is a RubyForge project to build an installer for 
> OS X ( http://rubyforge.org/projects/osx-dist/ ).  The project 
> maintainer has not released a .pkg file yet...I will contact him and 
> ask status.

I am that maintainer. The status is that I wanted to release a version, 
which would properly install the readlines module as well. That turned 
out to be slightly more complicated than I envisioned, though. So it 
didn't move much further than that.

I quick probably do a quick release of "just" a compiled Ruby 1.8.0. 
That's better than nothing at all ;).

On a longer term, the idea was to put together a series of pre-compiled 
packages. Like one for web-development that would install and setup 
mod_ruby with Apache, include the MySQL extension, and more.

I'm all ears for additional ideas.
--
David Heinemeier Hansson,
http://www.loudthinking.com/ -- Thoughts for free
http://www.nextangle.com/    -- Thoughts for hire