Joe wrote:
> I was hoping for at least a cross platform packaging format, similar
> to jar for Java but specific to Ruby.

If you want to package a set of pure ruby files (no extensions, no 
interpreter) into a single script file, you can try darb:

http://raa.ruby-lang.org/project/darb/
http://redshift.sourceforge.net/darb/

Not as fancy as jar, and limited, but useful in some cases.

-- 
        vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407