What model Toshiba Pocket PC?, if it's the E740, E755 series, these either came with bluetooth or wifi inbuilt.
If its a Genio e550G it doesnt have have inbuilt wifi or bluetooth however does have a CF card and SD card slot, as does the E740, E755

If it's a E310 or E330 then these only have a SD card slot.
There are bluetooth SD Cards available, however wifi SD cards will be out soon.

Yes I agree wifi is your best bet, depending on what model PPC you have either inbuilt or CF wifi card and an access point connected to your existing LAN.

cheers,
Jai