i havent seen n hdmi cable for xbox yet nor the 360, if you use component cables or vga you receve 720p so it is still HD
althoug at current state component is the best you will recieve on a tv, i had my 360 connected to a 55" wide rear projection with 1080i and then to a 42' plasma and it seemed only with EA sports games (madden and live 06) that it looked tremendously better on the plasma, i sold madden and bought it again after i got the plasma just because it looked 50 times better, i first noticed it on the demo at best buy, i wondered why it looked so different in the store on a plasma then it did on my rear projection, i still cant find out why but ohwell, i remember when first setting up my 360 it asked me type of tv it was connected to and i selected rear projection, after connecting it to a plasma i tried to change the settings and cant seem to find them even after running the set up wizard from scratch, i cant get to this ever again, i can change aspect ratio(480p 720p 1080i) but cant get to the display selection again where it says crt flat panel projection and all, maybe the update did something to this