Standby excluders, those remote-control devices you can plug in to turn off your electronic devices instead of leaving them waiting for their own remote control signal, don't work. The trouble is that most modern electronics are pretty darn good at not using a lot of power on standby, and the remote control standby excluders themselves are in a kind of standby mode all the time, waiting for a remote control signal. So you're really just swapping one standby device for another and hoping that the new one is more efficient. And according to my own digital power meter, they're exactly as efficient as my TV and microwave when they're off.
Mokalus of Borg
PS - There might be some devices where they work, though.
PPS - But for me, they don't save any power.