iconoodle is an AppleScript (droplet) that simplifies the conversion of ICNS to PNG image files.
Features of iconoodle:
You can not only drag & drop ICNS files, but also applications onto iconoodle’s icon and it will convert all ICNS files found in the application package folder
You can set a default archive folder for the created PNG files
You can execute post action scripts to further process the created PNG files, two sample post actions are included with the download
Convenient preferences panel to adjust the settings