I have two Zire 31 and charge them either via a IPhone charger (using a different cord) or by an LG cell phone charger.
The USB mini plug charger is very slow (yeah you can charge when the computer is on via the USB) and I suppose no drivers required (but if you have a Palm desktop on the computer then the driver would logically be there.)
I am not sure about the Zire22 but the zire 21 sometimes has a slightly different power plug than the one on Zire 31.
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Th-55 U, T/X, TG-50, Handspring Deluxe (3) and PSP user.
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