Name: Extract Application Icon
Mac Platform: Intel
OS version: OS X 10.5 or later
The .dmg contains an App (Droplet) that you can drag apps onto, and a Workflow (Service) that can be installed and lets you right-click on an App to extract the icon.
A README is included with instructions.
(There's also a bash function that I wrote if you want to call it from the command-line, it is included in the dmg.
I STRONGLY recommend optimizing the PNG that is created (for everyone's sake), just drag it into ImageOptim and it will be replaced by a much smaller sized file with no perceptible loss of quality! (Helps cut down those 1-2 MB icons to ~200kb). This REALLY speeds up how quickly the image loads, and is pretty essential.