In January 2012 I started injecting all my power data into a SQL DB (SQL Express). This has allowed me to use Tableau (www.tableausoftware.com) to analyze the utilization.
Here is an example of that power consumption in my House.
You can see my office plugs (where my Media Center is located) is my #1 consumer of power. You can see that the TV and Kitchen outlets are in second place.
I used the data shown here to determine that my 1st floor lights use a lot of power. This weekend I replaced those 400 Watts of lights with new LEDs (Phillips Ambient LED, http://www.amazon.com/Philips-409904-Dimmable-AmbientLED-12-5-Watt/dp/B004IUMGV4).
You can see from the graph below how much power I used to watch the "BIG GAME".
Based off this and a power cost of $.09/Kwh it cost ~$.24 to watch the game.
(539 watts /1000 = .539Kw * 5 hours = 2.70KwH * .09 = $.245)
This does not include the cost of beer, snacks, the cookies, steaks or stress.