You can also monitor any additions to this folder (introduction of new Widgets) through the use of Mac OS X's built-in Folder Actions via the following process:
1. Control-click (accessing the contextual menu) anywhere in a Mac OS X Finder window or on any folder and select "Enable Folder Actions."
2. Navigate to the ~/Library folder and select the "Widgets" folder.
3. Control-click on the "Widgets" folder and select "Attach a folder action."
4. Select the script "add - new item alert.scpt" (located in the folder /Library/Scripts/Folder Action Scripts/ which should appear immediately by default) and press the "Choose..." button.