Radios, televisions, stereo equipment, microwave ovens etc all use some power on standby how much I don't know probably not a lot. My wife goes around at night turning things off at the wall that aren't essential (she says fire risk). Some things like the fridge, chest freezer, alarm, heating controls etc are permanently on. I suppose things like occupancy sensors and PIR lights also use a little power too.
I'd be interested to know how much leaving things on standby actually uses