Since moving my network monitoring and other mobile device notifications across to Pushover, I have missed the ability to forward Growl notifications on my Macs. Growl 2.0 ships with plugins for Boxcar and Prowl, but not Pushover. For simple scenarios like HardwareGrowler being able to tell me when someone has accidentally unplugged a hard drive on my media centre, this was really cool.
With that, here is my Growl-Pushover action style / plugin for Growl 2.0. It has all the usual filters like an idle Mac and minimum priorities, and with the new action configuration engine in Growl 2.0 can be quite powerful in forwarding specific notifications to Pushover.