We have a channel carrying 2 720p feeds and a 480p feed all on one channel.

The HD channels are a bit soft (8.1Mbps for 720p) but definitely 1000% better than SD which is about 2.2Mbps on the 3rd channel.

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Hitachi 57F59; Sony VHP-D50Q - 7' diag on wall
DishNetwork ViP722k; DishNetwork ViP211; DishNetwork ViP211K; DishNetwork 301; 2 - TiVo Series 2's; Accurian 6000; Samsung SIR-T351; Panasonic Showstopper 2000; ATI HDTV Wonder
Hauppauge HD PVR; Sony PS3; Toshiba HD-A3 HDDVD
Dish 1000 on 110,119&129; Dish 500 on 61.5
RS U75-R; Funke PSP.1922