Kudos to Frog in a Box, who pointed out a short article at pc.ign.com regarding 3Dfx's new FXT1 compression techniques. Sure enough, Halo is involved, as Bungie appears to have voiced their support for this new format/technique. Presumably to be included in the Voodoo4 chipset, FXT1 is used for compressing textures, and may make quite a difference in upcoming games.