PaulS:
Actually making that shield use other pins for serial communication may or may not be easy. The shield itself is a lousy design in that it doesn't provide for that capability. You'll need to use a breadboard and a bunch of jumper wires instead.
If you look at the schematic and the image of the board they do allow the RX/TX pins to be changed. Just de-solder current jumper settings and bridge to the other side so serial becomes D2 & D3 instead of D0 & D1.
