Support for Growl 1.3 with the gist https://gist.github.com/2030825
Either directly infused in the code or via a new gem (the gem is maybe easier to deal with).
Attaching code as patch requested in: https://gist.github.com/2030825
This might want refactored and details for using ruby_gntp are here: https://github.com/snaka/ruby_gntp.
Might also probably need checks to make sure code isn't run on non OSX systems depending on how its integrated.
Sorry, never had time to add this in. Growl is not used as much these days .