This module enables you to show thumbnails of images from the pages in the admin page tree.
After installing you can define some options if you like to specify a width/height of the thumbnails and also change the look with some css options, like border padding and background color.
The configuraton allows you to add a list of template along with the image field name you wish to output a thumbnail from.
It works for single, multiple and cropimage image field types. If multiple images field it will always take the first image from the stack.
Example:
basic-page,image
Would show a thumbnail for all pages that use basic-page template and have an image uploaded to the field image.
Or for croppable images you can define a crop setting (using dot notation):
basic-page,image.landscape
This will show the thumbnail you set in the croppable image with the name landscape.