Awesome idea dunk. I gave you a thumbs up for helpful. I will try running it into another PC. What is a rollover cable?
another name for a rollover cable is a "null modem" cable.
basically the Transmit pin on one serial port goes to the Receive pin on the other and vice versa.
if you are running your motor driver without hardware flow control you will only need the following connections:
Gnd <> Gnd
TX <> RX
RX <> TX
if you do have hardware flow control enabled you will need to connect a few more pins.
search for "null modem cable" in that case.
once you have built/found your cable you can test it using 2 PCs running hyper terminal.
anything you type in one console should appear in the 2nd.
try digging through the various windows options to see if vista can log your serial port output too.
that will tell you the same thing.