Find out what you use on a more detailed level. The one big number that covers everything for an entire month doesn't tell you what your low hanging fruit is. You can get a meter that plugs into your wall, then your appliance plugs into it, and it will tell you how much energy your device is using either at that instant, or over time. This only works for things that plug into a standard 120v wall outlet, so it won't help for your electric dryer, electric water heater, climate control, etc. Leave your TV plugged into it for a week, then, with just a bit of math, you should have a good idea what percentage of your bill is due to your TV.
You can guesstimate energy consumption of those bigger devices by using a stopwatch and reading your electric meter.
How to Measure Home Wattage. Just measure a baseline, then go turn on the big device, take another reading and then subtract your first reading from your second.
I've used both of these approaches and entered the data into a spreadsheet. I can tell you that my fridge accounts for about 13% of my power bill (during months when heat/AC are off). Coffee maker is about 4.5%. And so on. This also showed me that our home 'server' (desktop PC) is consuming 7% of our power. I'm replacing it with a external hard drive that plugs directly into our home network. This one thing should drop our power bill by about 5%. The savings on the power bill will pay for the external hard drive in roughly a year.
The one thing I'm not sure about is my water heater. I'm taking this to a bit of an extreme and have purchased a meter base and a meter off ebay to install on my water heater. The information provided by this meter will help me decide if I want to pursue solar water heating (which is more cost effective than solar electricity).
The information you gather will help guide you so that you don't go out and spend $600 to replace all your light bulbs with new nifty LED bulbs, only to find out that your power bill hardly changed (as the lights were only 1% of your usage).
Though, there are some things that are obvious without collecting all the data. Like, I need to string up a clothesline so we can stop using the electric clothes dryer.
Keith