perhaps the point of having an "A" socket on the device (and hence
it's charge cable is A-A) is to allow the device to power something
else when it's been charged. In a sort of battery pack fashion rather
than simply a battery charger

My iTrip for my iPod came with a car charger, where there is a
cigarrette ligher thingy with an A socket, and an A male to mini-B
male cable. Phones are often similar. So the itrip/ipod and many
mobile phones can be charged by plugging their lead's A plug into a
host port

With the A socket on the device, potentially charger cables like these
could be plugged in, and the rezap might pretend to be a Host port.

just a guess. probably wrong. Only logical explanation i can see for it.
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