I found only one driver from Ratoc for their compact flash, but it doesn't work for my card reader, canon A70, Canon 300D, and when I connect a device it ask for driver name. The only device is working is a usb stick with 2 GB. I've tested all this devices with and without having the power supply connected, so it's not a problem about the fact that the pda isn't able to power on the devices.

Cheers.