I've been tossing around the same idea for a while. Just now getting my Carpc in my G-wagen and would love to do Canbus integration, particularly the audio and instrument display. I've got some factory docs on the various MB canbuses and what they do and the different device addresses etc., Unfortunately, I don't have a canbus interface yet. I know there are a few USB varieties out there, but they were pretty high priced. I only have few seconds before my laptop battery dies. I'll try to gather up my info in case it will help.