While the title would leave one to believe that this is a "light" version of the Twilight: 2000 rules, the reality is different...
Published in 2006, the Player's Guide (Version 1.0) covers the history and development of the game system from a historical perspective.
An Introduction (covering the cultural atmosphere of the mid-1980s in the US).
The Challenge of Military Role-Playing (excerpted from Heroic Worlds, A History and Guide to Role-Playing Games, Prometheus Books, 1991)
The Twilight: 2000 Concept
The Twilight: 2000 Canon (a sequential list of T:2000 modules which includes the print run of each module)
Comparing the Modules (ratings of all the modules based on information given by 42 players).
The Twilight Modules (a listing, with cover pictures, of all of the First Edition Twilight 2000 items with a small bio-style listing for each item... cover 15 pages)
The Designers (information about the various contributors to the series)
The Twilight: 2000 Adventure (how to play the various modules set in the USA, and mini-modules from Challenge Magazine, as one long campaign).
Index for Challenge Magazine Twilight: 2000 Articles
Who We Are... (information about Far Future Enterprises)
This Guide is a free PDF available at the time of this writing at DriveThruRPG.com. Unfortunately, there are no credits included for Designers, Production Staff, etc.