This book acts as a companion to the Green lantern epic "The Sinestro Corps War", collecting short stories, one-shots and a bunch of fact sheets about the GL characters and universe.
All in all, it's just filler material (re-telling of what happened elsewhere, expanding on some details, providing backstory for throwaway characters) and boring data. All I can save from the book is a Superboy-Prime story written by Geoff Johns and drawn to perfection by Pete Woods and Jerry Ordway. Too little though, to recommend anybody but the most hardcore Green Lantern collectors to buy this trade paperback. Good thing I got it for less than 13 bucks, at least!