Most of our newer UPSes at work have this display. Really handy for balancing loads too. I need to check and see if there is an easy way to default the display to the wattage used, as after a power event they all revert to showing the voltage instead.

Around the house I use a kill-a-watt to check on various things. Though living back in Texas, the AC is back to leading my energy usage. In California, I did manage to keep my power usage down enough to stay in the first tier of billing. Eco and wallet friendly, handy they go together

I shifted all my desktop type activity over to the Core 2 Duo Mac Mini a while back. With the monitor, looks like I'm sitting at ~36 watts to be here on this page, with the typical iTunes and other pieces open in the background.