I think you all know “Halo:Zero” it´s a fanmade J&R-Game. You play MC on Reach and you have to escape to the Pillar of Autumn. On your way you have to complete a few small missions like defend a generator or rescue Sgt. Johnson.
I think (if the guy(s) from “Doberman” allows it) 343 could/should at a DLC-Add-On for Halo Anniversary, where you can download Halo:Zero for the 360. That would be a great sign from 343 that they care about their fans. It should be a Add-On for Halo Anniversary, so it would be still exclusive for Halo Fans who buy Anniversary 
Well… with “Gunman Chronicles” it worked; it was also a fanmade game.
But Sure: The DLC should be free here!
Also they should add a level-music replacer, where you can replace the “normal” Halo CE-Soundtracks with tracks from your 360-HDD.
… Because all guys I know replaced the Halo:Zero Level Musictracks with their own music.
(This they should ask the guy(s) from “Doberman” aswell.)
Oh… And may be some skulls?
What you think?