You love Halo, right? I mean, really love Halo? Love Halo enough to drop one-hundred and thirty clams (US) for the Legendary edition of Halo 3, which comes packaged in a life sized (but not wearable) space-marine helmet? IGN has the details on exactly what you'll find crammed inside:

The previously announced Spartan helmet case is still in alongside two bonus disks of extra content. The first disk holds behind-the-scenes footage including a high-definition documentary titled "Making of Halo 3." This disk will also include an audio-video calibration tool designed by Bungie to help gamers get the most out of their home theater systems. The second disk will house remastered cinematics from Halo: Combat Evolved and Halo 2 with new developer commentary as well as a featurette documenting life at Bungie. Last, but not least, the Legendary Edition will come with a set of Halo 3 storyboard art from Lee Wilson.