I unplug things not in use at home to save electricity. Xbox, microwave, fans. Things I cannot unplug are stove, fridge, TV (cable box takes 10 mins to reset other wise).
Noticed savings of $20 a month by not having xbox plugged in when not in use.
Those are called "vampire loads", as in, they suck energy without you noticing.
Some Home Theater devices -- TV, projector, Audio woofer -- can all be "on" and pulling energy even when "off" (which is more like "standby"). Some TV's have settings to disable "instant on" or "standby mode" to stop that device from being on.
Game systems are really bad, as are new smart TVs and disc players, as they are network-enabled. While off, they can be polling for updates or simply maintaining the DHCP IP address when it expires.
You can get smart power strips and smart UPS power batteries to help with this. You plug a "master" device into the master plug, and all the associated devices (audio, DVD/BluRay, game console), in the controlled plugs. When the master device drops below a set level of power use (basically off), all the controlled plugs are turned off. So, by turning off the TV, everything else would be disabled at the strip.
One of the very worst devices is your Cable DVR. It stays on all the time for recording and updates. Some companies have been working on more efficient versions.
For about $10, you can get a single-plug energy monitor. If you plug that into a device, you can tell if there is any power usage while it's off. The monitor can also record the energy used by a device over time to identify heavy load appliances.
Lastly, if you have an electric water heater, you should look at converting to a solar heater. That's the number one energy consuming appliance in almost every home.