My utility recently made smart-meter metrics available (even raw data feeds) with 15min resolution for all energy use and pricing. It's been incredibly helpful, however my biggest electricity hog is my refrigerator.

However, the hardest thing to do when figuring out what uses / wastes electricity in your home is establishing a baseline with the most appliances / systems turned off as possible.

My apt is well insulated, but for me it's still crazy (even packing the fridge with as much thermal mass as possible), and furnace / AC turned off at the breaker my apt still uses around 8KWH per day. Water heaters and refrigerators have a long way to go! Curiously, leaving my AC / furnace completely off or on at about 80% cooling a 20F delta uses very little power, exciting how efficient modern climate control is :).