Apple.com Article > Creating a Folder Watching Workflow

A very powerful automation feature that is often overlooked in Mac OS X is folder watching. Prior to Mac OS X Tiger, folder watching was possible by writing custom AppleScripts and attaching them to folders to process incoming items. Now, with Automator in Mac OS X, it is easier than ever to turn any folder into a watched folder, with no scripting necessary.

The following steps will walk you through the process of using Automator to create a folder watching workflow in Mac OS X. This particular workflow will automatically create padded thumbnail versions of full size image files as they are placed into a watched folder. [Read more...] (pdf)