>> Yes, but 4 W!!!!  4 mW should be enough.
>
> Perhaps, depends on what other features the kit has, though.

How about running an LCD panel, transmitting and receiving data from a 
base-station 10s of miles away, interpreting incoming data packets, waiting 
for key presses?  All for 10 mW.

> I know, for example, that the system I have here at my feet has an ATX
> board, which means the "power" switch is solid state rather than a
> physical switch.  That means the board is powered all the time (when the
> power supply switch is on at the back of the system).

The main point is that mainboard and PSU makers have no incentive to make a 
low power and efficient "off" state.  Really, such a small fraction of 
people/companies will make a decision based on the efficiency of the off 
state it is not worth it at all.

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