This week a friendly backpacker came and installed (plugged in) these two devices in my house for free, they arrived after I responded to an add in the local paper. Now, if the telly has been on for an hour, it suddenly (and still unexpectedly) turns itself off, you can change this setting to a longer watching period but I quite like the heavy handed reminder that we've been sitting still for too long. When the computer is turned off all its associated equipment is shut down too. No more sucking energy for no good reason.
Some other things we've been doing to save energy.
I've been experimenting with turning off our hot water service for a couple of days at a time, it seems that we have enough hot water in our tank to last at least three days, so it need not be reheating itself every night.
I've been using our solar rocket a bit more this month and we boil the kettle and then fill a Thermos only once or twice a day to make our cuppas.