The best game that I have in HD is Halo2. It looks awsome. Only complaint tho is that you will see some models get rendered or drawn a little slower, kinda distracting sometimes but the visuals make up for it.
I noticed too that Tony Hawk: UG2 will not show on screen unless you turn off HD in the Xbox video settings. That's the only game I have problems with.
Oh and this is on a 36" CRT HD TV
