I visited Lua's Tutorial Directory and got the feeling that Ruby should
have such place too.  This would be a good place to make contributions.
I hope a few of us have some (not yet allocated) sparetime to put into it.

At the moment Ruby's directory is rather empty.
http://www.rubygarden.org/ruby?TutorialDirectory

try compare above with Lua's tutorial directory.
http://lua-users.org/wiki/TutorialDirectory

--
Simon Strandgaard