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By standby I mean any power state where the power supply is partially on and providing standby power to the motherboard. Anything where there isn't a proper switch in the off state.
If you have any sort of soft power button then there has to be a source of power for it. So the power supply has a standby power circuit that is running all the time just for this purpose. It can also power the keyboard and the network card. As I said was surprised that my power supply got warm in this state. I'm sure that things are better now with energy regulations. Still, it's easy enough to have a power strip with a big red switch on the desk. It powers up my monitors, amplifier, powered USB hub, etc. as well.
nneil
This is what 'hibernate' is for. If by 'standby' you mean 'sleep'.