I believe I saw the B&D model on an episode of "Ask This Old House". Not sure if any competitors offer a web or iPhone interface, or just the receiver devices, but in any case this is a useful form of feedback that will likely become a standard feature as the monitoring equipment gets cheaper.
Black & Decker EM100B Energy Saver Series Power Monitor: http://www.amazon.com/Black-Decker-EM100B-Energy-Monitor/dp/...
Blue Line PowerCost Monitor: http://www.amazon.com/PowerCost-Monitor-BLI-2800/dp/B0028LS5...
I believe I saw the B&D model on an episode of "Ask This Old House". Not sure if any competitors offer a web or iPhone interface, or just the receiver devices, but in any case this is a useful form of feedback that will likely become a standard feature as the monitoring equipment gets cheaper.