gutupio has posted a link over in the HBO forum to what just might be the first true 100% HUDless Halo film. (Silvergrunt earlier did a WMV with HUDless clips in it, and others may have as well.) It's a 20 Mb DivX-encoded AVI, and reportedly the closest it has to a title is Entry 1, which seems to suggest to me at least the theoretical possibility of an Entry 2 at some point.
We've added a mirror of Entry 1 in our Halo Movies section.
Everybody is doing it now. And just when you think you can start to ignore new HUDless screenshots, some really nice ones come along.
CuBaNo put up two nice collections (one, two) in the HBO forum. Michael M put some up and asked for someone to host, so we did. And last but not least, Mills put up hi res versions of his collection from earlier.