If you simply want to review your energy consumption in real-time, look no further than Neurio. But, Belkin and startup Ecoisme are expected to offer similar products soon (that promise to do more than Neurio), so I'd hold off if you're on the fence.
Neurio monitors your energy consumption, sends you usage alerts and reminders, and can be used in conjunction with IFTTT, SmartThings, and Raspberry Pi.
Neurio dishes out real-time energy stats so you can save money and consume smarter.
Neurio may look pretty basic, but this smart gizmo gives you a real-time look into your home's energy usage.