I watched the Halo 3 trailer in High Definition and let me tell you, if you don't have HDTV, you had better get it....'cause the graphics looked spectacular.....But that is usually the difference in both the resolution formats......Which is why Microsoft told everybody, when the 360 came out, that you will be able to finally enjoy "True High Definition" Gameing....and they also said "For people that don't have HDTV, you'll still enjoy games that will look better than you've ever seen"......So, either way you saw the trailer, whether on HDTV or standard resolution, the trailer was a great introduction to Halo 3.....Now, if you wanna comment on the actual graphics, make sure you watch on an HDTV before you make the call