Automator

Apple Automator is a new technology for scripting applications, first to be implemented in Mac OS X 10.4 "Tiger", the new version of Mac OS X that was released on April 29, 2005.

Ease of use
Automator allows point-and-click ease for automating repetitive tasks. Automator enables the repetition of tasks across a wide variety of programs, including the Finder, the Safari web browser, iCal, Address Book and others. It can also work with third-party applications such as Microsoft Office or Adobe Photoshop.

Although Automator uses AppleScript and/or Cocoa, it requires no expertise in these languages whatsoever.

How to use it
Automator comes with a library of many Actions (file renaming, finding linked images, creating a new mail message, etc.), all of which act as individual steps in a Workflow document. A Workflow document then can be used to carry out repetitive tasks. A user can also save these Workflows so that it can be used over and over again, whenever it is needed. UNIX command line scripts can also be invoked as Actions.

Sources and References

 * Apple Automator