So you want to be able to insert the sd card from your phone and have the computer sync it automatically as if it were the phone? I don't think it's possible, as the computer would just recognize it as a standard sd card. You'd still need the phone attached in order for the PC to figure it out.
active sync an sd card to a pc
its an ipaq enterprise
so is that the only way each time to work with office excel files between pda`s and pc`s is to take the card out each time