Was at a friends today and he showed me an energy monitor that he had bought and was using to monitor his electricity supply. I was like "hmm... this could be something fun to attach to an XCore and get some graphs out of".
My thought is to use my XC-3 (or maybe get an XC-2) to connect to an energy monitor receiver - or hack/make a receiver and then push the data somewhere useful via Ethernet. In fact I could combine it with my network monitor, ditch the screen and have it push the all the different types of data out into some nice pretty graphs. Anyway, enough brain dump - onto the hardware!