Thanks a ton for the info. For a TDI owner, it seems like ecomodder is a great site for general knowledge as well as a good place to point my gas burning friends to. For TDI specific info, I'll be spending lots of time reading the
TDIclub Fuel Economy forums.
My ScanGuage II should be waiting for me when I get home from work tomorrow. I haven't even started with hardware and I'm already trying to figure out how I might be able to integrate a touch screen PC running vag-com into my car.