Joe said:ghaleon where did you read that space elevator theory? that was pretty cool and would be absolutely sick if true.
It was tossed around at HBO ( http://halo.bungie.org ) for the uninitiated. Just looking at that tower in the background, I can't think of anything else it would be.
Here's the news post that started it:
http://halo.bungie.org/oldnews.html?item=9568
And the thread that stitched some more of it together:
http://forums.bungie.org/halo/archive6.pl?read=140337
The best evidence is really the picture on the LE box, though.