I'm pretty bad - the wife and I leave our PCs running 24x7. We consume alot of power in general. We don't notice it so much since we live in what may well be the cheapest place to have electricity in North America - that being the province of Manitoba. Our government-sponsored monopoly company generates a crapton of power all by hydro-generating dams mostly in the remote northern parts of the province. We generate way, way, WAY more power than our small population can use, so we sell off the excess to neighbouring provinces and US states. The revenue from those sales causes our local consumer price per kW/h to be extremely low.

For a couple years I lived in a different Canadian province and I noticed that out there (AB) the electricity is about 6-10 times more expensive! My tiny apartment I had out there cost just as much to power (with nothing on for 14+ hours a day except the fridge and my alarm clock) as my 1400 sq-ft house here, where lots of electrical stuff is on all the time as my wife is a stay-at-home mother.