A command line utility for managing Mac OS X dock items. Written in Python. Makes use of plistlib module included in Mac OS X. Compatible with Mac OS X Tiger and Leopard. Add, List, Move, Find, Remove Dock Items. Supports Applications, Folders, Stacks, URLs. Can act on a specific dock plist or every dock plist in a folder of home directories.

Source is maintained on github now. https://github.com/kcrawford/dockutil