I've been playing with the new "Theater" feature in H3 that allows you to take screen shots of the action in a game you just played.
You can see all my stuff on my Bungie profile here: http://www.bungie.net/Stats/Halo3/Default.aspx?player=Red%20Toof
But here are some samples:
Shot of my friend playing "the Arbitor" in co-op on level 1.
Shot of me dieing (I do that a lot)
Shot of me on the new "Chopper"