Panasonic (TH-50PZ70B) it's a 50" Plasma so I knew it would be high but that is still a suprise, this is a Full HD set and was not a cheap so you'd think there'd be some power saving features. After a quick look through the "operating instructions" as Panasonic calls them, under power consumtion you get Average Use (569 W) and Standby Condition (0.5 W).
I think I'll have to get a power monitor and see how it "averages out" myself.