I picked up a Driving Force from the local Goodwill. Very decent price. I see I don't have a power supply or the pedals installed, but my computer detects it and it WORKS. I just want to get it working with MAME. I know it works because looking at the Controllers panel I was able to see all the buttons lighting up and 2D representations of the wheel's 2D position (a 2D graph with the wheel moving the cursor left/right and two pedals behind the wheel - kind of like backup foot pedals - moving it up and down).

Just a note - this is apparently the same controller available for the PS2, but with a USB controller.