2x Xbox 360 and PS3 on 56" DLP HDTV at 1080i
1 Xbox 360 and PS3 running on HDMI w/ 7.1 receiver (using optical jack for sound)
1 Xbox 360 running through component and through the same receiver (uses rca jack for sound)
I can move to a smaller 42" 1080p capable HDTV but I like it better on the 56" screen. A lot better for 8 player Halo 3 split screens.