To use this script you must first specify a single folder that you wish to monitor. You can specify the folder by dragging a folder on top of the application or by launching the application and selecting a folder in the dialog. "Alert When Folder Changes" should then be left to run in the background while you perform other tasks. If any new items are added to the folder the application will switch to the Finder and let you know what the new items are in the folder. Changing the "TimeToSleep" property allows you to change the frequency that the folder is checked.
