Todd's suggestion to find a small usb sd card reader is the best option,
then use as many SD cards as you need to carry data... stick the sd in
the ppc, or use the card reader to read the cards in a pc.

The other part of the "why" is that most pocketpc's do not have usb
"host" capabilities, so they can't access usb devices. A very few ppc's
have usb host capabilities, and, if the thumb drive uses standard ide
mass storage device drivers, add the correct cable and those few ppc's
_could probably_ read most thumb drives.

Beverly Howard [MS MVP-Mobile Devices]