Thanks for your response. I now have XBee's setup using the Kill-A-Watt software. And I am displaying using EnergyLogger.
Now the voltage sensor input (AD0/D100) what type and value of voltage is it expecting? DC Voltage, Micro Volts, AC?
Just for experimentation, could I hook a 1.5v AA battery to Grd and AD0 and get a reading. By the way, I am using Parallax 5v/3.3v adapter board.