Reply #18: The easiest thing to do is watch the meter spin then shut everything down [View All]

and once it is stopped turn things on one at a time to find the ones that make the meter spin the fastest. Those items will pull the most juice. Kill a Watt will only work on 120V single phase items not 220V appliances like AC, Electric Range, Stove or Hot Water Heater the biggest users.
One thing I do is put all my tv's and even the microwave on a switched strip and turn it off when not in use, the TV's and other electronics have a transformer running the moment you plug it in cable boxes use about the same amount of power turned on as off due to the transformer. Also Remember the Compact Fluorescent Bulbs! The light of a 60W bulb for just 13-15Watts you could run 4 CF lights on the cost of one old style incandescent bulb just do not use with dimmers read the following! Oh yes some utilities will even give out free ones or rebates for buying them!
Good luck!
http://www.energystar.gov/index.cfm?c=cfls.pr_cfls

How to Choose the Right Light:
Matching the right CFL to the right kind of fixture helps ensure that it will perform properly and last a long time.

For example:

CFLs perform best in open fixtures that allow airflow, such as table and floor lamps, wall sconces, pendants, and outdoor fixtures.
For recessed fixtures, it is better to use a reflector CFL than a spiral CFL since the design of the reflector evenly distributes the light down to your task area.
If a light fixture is connected to a dimmer or three-way switch, you'll need to use a special ENERGY STAR qualified CFL designed to work in these applications. Make sure to look for CFLs that specify use with dimmers or three-way fixtures.
Choose a qualified CFL that offers a shade of white light that works best for you. For example, while most CFLs provide warm or soft white light for your home, you could choose a cooler color for task lighting.
To choose the ENERGY STAR qualified CFL with the right amount of light, find a qualified CFL that is labeled as equivalent to the incandescent bulb you are replacing. Light bulb manufacturers include this information right on the product packaging to make it easy for consumers to choose the equivalent bulb. Common terms include "Soft White 60" or "60 Watt Replacement."
You should also check the lumen rating to find the right CFL. The higher the lumen rating, the greater the light output. Consult the following chart to determine what CFL wattage is best to replace your incandescent light bulb: