In case anyone was interested in the USB interface module here is what they said. Great response! I think I may pull the trigger soon!
"The interface is a unit with memory and processing power itself. It has a cable that plugs into the unused connector on the ScanGaugeII and another that plugs into a USB port on a computer. They don't have to both be plugged in at the same time.
The interface will use SD Cards for data storage. You can plug it inot the ScanGauge for logging and for other upload/download tasks. It can be removed from the vehicle and taken to a computer for data transfers.
The ScanGaugeII has all the hardware needed for the interface, but will need an upgrade of its program to use it. The Upgrade is free when you purchase the interface.
Price has not been finalized yet. It is expected to be under $100. This will also include the software for a windows based computer."