Make StuffIt Compressed  -  This script converts disks or disk image files to ShrinkWrap 3.0 disk image files using StuffIt compression, then deletes the originals. The disks, disk image files, or folders containing disk image files can be specified by either selecting the items in the Finder and then launching the application or by dragging and dropping the icons onto this application.

A sample script for ShrinkWrap™ 3.0 by Chad Magendanz