Here is a site where u can post ur theories about the ones listed below and your own...
* what will happen at the end of Halo 3
* what is the whole history of halo up till Halo 3
* What books will come out and what will they be about
* will there be any more games to the Halo 1,2,3 series
* will there be any more games related to the halo universe
* who r the forerunners
* how did the flood originate