In order of things that draw power, check devices that generate heat, followed by devices with motors. If you have an old fridge, that can be using more power than anything else. For example a 20 year old fridge in your garage or basement keeping a dozen beer cold will cost you more in power over 6 months than the cost of buying a small beer fridge.
Don't rule out lighting either. If you have a fixture with two 100 watt bulbs that runs 24/7, switching it to 23 watt CFLs will save you 100 kw/h per month.
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