The Kill-A-Watt is pretty accurate in my experience. My Wii uses 2 watts in standby (with wiiconnect off). I always keep it unplugged. Most things in my house are on their own power strip, with individual switches to turn each device off as I see fit.
I have a main switch that gives power to the power strip, and the power strip is then divided by device. Very nice stuff, but I am not sure that you can find anything like this outside of Japan. Over here they are common everyday items though...
So to answer newtonsfirstlaw's question, the Kill-A-Watt does display amounts between 0-5, in whole numbers.
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