Halo 3: Limited Edition

Has a three-way folding steel container.
Bestiarum: A hard cover, bound collection of information and art covering the species, cultures and civilizations of Halo 3.
A relatively small poster of John-117 and the Arbiter.
An illuminating collection of original "Halo 3" storyboard art from artist Lee Wilson, depicting key moments and pivotal scenes from the epic cinematic production of "Halo."
An extra disc that contains exclusive, behind-the-scenes footage and videos, a high-definition "Making of 'Halo 3'," a documentary showcasing the Bungie team and its effort to create the most anticipated title in the industry's history, numerous high-definition featurettes documenting the creative design processes involved in developing the game; and a look at some early game concepts and their evolution through the game's development.
The extra disc contains an audio-visual calibration tool.