Hi,
Did you tested the sensor itself? How?
Are you sure it is working?
I'm working in the same project from the energy monitor website, but i bought a current sensor ( see here: http://arduino.cc/forum/index.php/topic,125863.0.html ), but i'm having a bad time to calibrate it. The value given in the datasheet doesn't give the right current value... I'm now finishing to connect a energy meter that gives me the current value to check what is wrong.. I hope.