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If you need a tiny 2.2 GB hard drive that has a USB 2.0 connector and needs no batteries or power cord then the I/O Magic GigaBank 2.2 may be what you need. The standard USB connector folds down into the unit for transport leaving you with a device that's only 2” x 0.5” x 2.5”. The little drive draws all the power it needs from your Windows-based computer's USB port. The capacity of the drive is just enough to carry your digital documents and some MP3s along with you. I don't have confirmation yet but this drive would probably work with Pocket PCs using a USB host port.
Scored the last one from BestBuy. Comes with a stiff side case, keyring and USB extender.
$150.