Well this stuff if way over my head. Thanks for your help though.
As I was searching for information around the net I found the company that designed the dashboard for MS. Their name is Rezn8. I thought I'd contact them to see if they have plans for a new dashboard that supports 480p. Really, it's silly that all (most) of the games support it, but the interface doesn't. Anyhow, I was contacted by a guy who said "As far as I know, the X-BOX cannot display in 480p. It was not designed for that and there is no "upgrade" that would make it so. Displaying output in 480p is a function of hardware and would require different display circuitry." I thanked him for responding and then told him that most games on the XBox do indeed support 480p. His reply was "Interesting...I'll call the MS guy now and get back to you."
I haven't heard anything, but it's interesting that he didn't have a clue about how the system performed.
Thanks again for your answers.