Knowledge will set you free.
Reading one of my left-wing eco-friendly blogs (yes, Treehugger) - I found an article about this little contraption. I forget the name, but it quickly measures your electrical usage in your entire house without calling out an electrician to install it. Had some quality issues with the received, but once they sent us a new one, everything was working great. Even bought the PC software package that graphs the usage. You can also set off audible alarms for when your usage goes over a certain threshold.
Key findings - we don't use a ton of electricity thanks to some non-incandescent lightbulbs, but irons and HVAC systems are killer. I don't think we'll end up saving the World with conservation - we'll need a smartgrid for that - but it is interesting to see what your usage is.