Titan Books have announced Halo: The Great Journey - The Art of Building Worlds, a very nice book with artwork from the last decade worth of Halo games from Halo: Combat Evolved to Bungie's most recent effort Halo: Reach.
The book contains more than 400 images including sketches and concept art from all stages of development as well as comments from the developers themselves.
All of this will come at a price of £25 when the book hits shelves in September. Sounds like a definite purchase for Halo fans out there...