I've heard several members mentioned viewing images with Lightbox.
Truck in the Mudd
Is this similar to a product called Lytebox which seems to be just a viewer/organizer?
http://dolem.com/lytebox/
Or is it similar to the "lightbox" application included with Olympus Viewer2 software? This is a screen shot from the Olympus software, it allows you to analyze an image for clipping in the highlights and shadows; among other editing options.