I came across some googled results where the kill a watt and Wattmote were mentioned. But I don't see anything like it in the store. I have a couple of applications of monitoring appliance power usage. With the logging and display capabilities of the Gateway, such a RF connected mote would be slick.
The WattMote worked with a hacked Kill-a-Watt. The effort to make that happen is not the least significant and I have noticed that different variants of the kill-a-watt will not allow enough power margin to power a moteino. The last one I tried simply would not even power up. The kill-a-watts have a tiny power supply that just power an opamp, a small MCU and LCD interface.
Perhaps more research could be invested to find an optimal low power sketch and startup sequence that would not kill the kill-a-watt.
I have long wanted to do power monitoring, in fact even before any moteino existed. But I never got around to doing it the way I want to. I think it was because it's rather hard to do it accurately, I wanted to use energy measurement ICs. But there are many ways to do it, lots of which use extrapolation of some kind and come very close to the real power used.
For completeness at this point I will just link Tom's excellent multi port AC monitor (https://lowpowerlab.com/forum/index.php/topic,1036.0.html) that uses Moteino, and an interesting piece of code to do the measuring.
(https://lowpowerlab.com/forum/index.php?action=dlattach;topic=1036.0;attach=554;image)
(https://lowpowerlab.com/forum/index.php?action=dlattach;topic=1036.0;attach=556;image)