> I am thinking about moving to a nice new Macintosh and was wondering 
> about the state of Ruby on the Mac.
> 
> Does it have Tk? This is quite important to me.
> 

Only OSX has the unix substructure, and the stuff the others are talking 
about. There would have to be a port for an OS 9 or less version, which 
I don't know exists yet.