From Listening PC:
With Fast Folder.JPG you can easily assign any image you choose to the covers of your folders. Drag and drop an image, or a folder containing multiple images, into Fast Folder.JPG to create a folder.jpg image -an image that changes the default look of folders, replacing it with a picture. The image you select is automatically resized and named, leaving the original image intact. If a single image is dragged and dropped into Fast Folder JPG it is used as that folders image. If a folder is dropped into the application containing only one image, that image is used. If a folder containing multiple images is dropped into the application, you will be presented with a selection dialog containing previews of every image. Simply click the one you want to use as your folder's jpg. This application streamlines the folder.jpg creation process.