FireDragon04's new Halo 3 Machinima Short called Dark Side, Lets the viewers take their own interpretation away from the video, or "it follows a very confusing un-linear story and doesn't explain anything but lets everyone take away their own conclusion to the video".
It is available in HD on Youtube:
Dark Side
http://www.youtube.com/watch?v=B58CW_nq7EY&fmt=22