USB won't help you unfortunately: as the USB is to plug into a USB host (ie, a PC) it's a USB slave and can't talk to other USB slaves (eg: NICs, ZIPs, etc). You can't plug host-host without a converter box.

There's simply no room for PCMCIA in the unit, believe me. The display takes all of the height in the front, and behind this it's just too packed. The serial port (which docks with the car) *can* be used for things apart from the protocol, so you *can* run PPP to a cellular modem if you wanted to.

Hugo