The main benefit, aside from that it's sort of cool, is that you would be able to write for Google App Engine in Ruby. Personally, I think that the similaritie

The main benefit, aside from that it's sort of cool, is that you would be able to write for Google App Engine in Ruby. Personally, I think that the similarities between Python and Ruby (particularly their bytecode similarities) makes Ruby the most obvious language to be added to GAE next; but there isn't anything quite as easy as GAE for getting your Ruby app off the ground right now.