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In layman's terms, USB has two basic modes, "host" and "slave". Scanners, printers, keyboards, and USB flash drives, for example, have USB slave ports, which can only be plugged into a USB host port on a PC (or other USB host device). These slave devices cannot actively connect to another USB peripheral, they are "dumb" devices. USB host devices contain the networking stack and intelligence that allows connections to up to (128?) slave devices if you use one or more USB hubs.
The PXA27x chip found on most recent PDAs contains full hardware support for USB host, but for some reason, dell and HP have decided to only have a USB slave port on their PPCs (the PXA27x supports both host and slave modes).
IF your pda has a USB host port, then WM2003SE already has built-in drivers for devices such as keyboards and USB mass storage devices (hard drives, USB flash memory drives, etc.). But there are not that many available drivers on WM2003SE. Perhaps some 56k modem drivers are lurking around? But I doubt you'll be connecting your laser printer to a PPC any time soon, for example.
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