It provides a replacement for the standard product listing, instead of several rows of text listing your products in a category, it shows the product image in a box with product name, price & short description (if you have that).
Clicking on the image or name take you to that product. An admin option allows you to switch between thumbnail view& old list view.
Modified version for os v 2.3
Original version for v 2.2:
Forum Thread started at: http://forums.oscommerce.com/index.php?showtopic=306162