Previews for iWork generates preview PNG
image files from the first page of your Pages, Numbers and Keynote documents.
You can specify a size for the generated image files. You can further more pick a background color if you want the preview images to have a color-filled background instead of transparency.
Simply drag a selection of files and/or folders and drop them over the applications drop box or select files and/or folders from the "Open" dialog.
The preview files will be generated in your Downloads folder together with a log file with useful information about the generation process.
Please visit http://www.cocoala.com/PreviewsForiWork for more information.