1up has Alex Garland’s (28 Days Later) Halo movie script. It comes in at 128 pages that I loved SO MUCH I read through all of them in a little under an hour. Man this would have been an amazing movie. Possibly the BEST movie of a video game ever made.
Megaupload has the link to download the whole script, so you dont have to settle for the excerpts posted on 1up.